
While breastfeeding is considered the best option for feeding babies, some parents wonder if switching to formula could help their babies sleep better. Research shows that formula-fed babies tend to have longer stretches of sleep and wake up less frequently at night compared to breastfed babies. This is because formula proteins are harder to digest, keeping babies fuller for longer. However, it's important to note that breastfeeding parents tend to fall back asleep faster after feeding, resulting in more overall sleep despite the higher frequency of night wakings. Ultimately, the decision to switch to formula involves various factors, and each family's situation is unique.
| Characteristics | Values |
|---|---|
| Average number of night awakenings | Breastfed babies: 2.52 times per night |
| Combo-fed babies: 1.71 times per night | |
| Formula-fed babies: 1.39 times per night | |
| Time taken for parents to fall back asleep after feeding | Breastfeeding: 19 minutes |
| Combo-feeding: 22 minutes | |
| Formula-fed: 27 minutes | |
| Total sleep for parents | Breastfeeding: 40 minutes more sleep than combo or formula feeding |
| Ease of digestion | Breast milk is easier to digest than formula |
| Formula-fed babies stay fuller for longer |
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What You'll Learn
- Breast milk is easily digestible, so breastfed babies wake up frequently to feed
- Breast milk contains the maternal hormone melatonin, which may help babies sleep longer
- Formula consists of casein protein, which keeps babies full for longer
- Formula increases the risk of an inflammatory response in the gut, which can cause bloating and pain
- Separation anxiety and sleep training methods may impact a baby's sleep more than feeding methods

Breast milk is easily digestible, so breastfed babies wake up frequently to feed
Breast milk is often regarded as the perfect food for infants, containing the ideal balance and amount of nutrients for their immature body systems. It is also easily digestible, which has its pros and cons. While it is gentle on a baby's developing digestive system, babies may wake up more frequently to feed as they get hungry faster.
Research shows that breastfed babies tend to wake up more at night than those who are formula-fed or receive a combination of breast milk and formula. On average, breastfed babies wake up 2.52 times per night, compared to 1.71 times for combo-fed babies and 1.39 times for exclusively formula-fed babies. However, it's important to note that these studies were conducted with parents for whom breastfeeding was going well, and individual experiences may vary.
The reason breastfed babies wake up more frequently at night is due to the digestibility of breast milk. Breast milk is more easily digested than formula, which means that breastfed babies may get hungry faster and need to feed more often. On the other hand, formula-fed babies may stay fuller for longer, resulting in longer stretches of sleep between feeds.
Despite these findings, it's worth noting that the time taken for parents to fall back asleep after feeding their babies should also be considered. While formula-fed or combo-fed babies may wake up less frequently, their parents take longer to fall back asleep due to the time needed for preparing bottles, mixing formula, heating up breast milk, and cleaning bottles. On average, breastfeeding parents fall back asleep within 19 minutes of feeding their babies, compared to 22 minutes for combo-feeding parents and 27 minutes for formula-feeding parents.
Ultimately, the decision to breastfeed, formula-feed, or combine the two should be made based on what works best for the parent and baby. Breast milk provides optimal nutrition and protection against health problems for babies, and it is recommended to breastfeed exclusively for the first six months if possible. However, there may be circumstances where formula feeding is recommended by a healthcare provider, such as in cases of low blood sugar or dehydration in the baby, or certain health conditions in the mother. Additionally, a varied maternal diet can alter the flavor of breast milk, preparing the baby for solid foods later.
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Breast milk contains the maternal hormone melatonin, which may help babies sleep longer
While some sources suggest that formula-fed babies sleep longer than breastfed babies, others argue that breastfeeding parents get more sleep overall due to the time it takes to prepare formula. Breast milk contains the maternal hormone melatonin, which may help babies sleep longer. Melatonin was detected in the evening and dropped to undetectable levels in the morning, following a circadian rhythm.
A study of 169 mothers of newborns measured melatonin in milk samples. The median melatonin concentration in daytime milk (10 am to 10 pm) was 1.5 mg/L, while the median concentration in nighttime milk (10 pm to 10 am) was 7.3 ng/L. Another study of 54 exclusively breastfed infants found that they had longer nocturnal sleep duration, which may be attributed to the melatonin in breast milk.
It is important to note that the research on the safety of melatonin use while breastfeeding is limited. While some sources indicate that short-term use of melatonin supplements is safe for breastfeeding mothers, there is not enough data to confirm this. The NCCIH recommends discussing melatonin with a healthcare provider before using it while breastfeeding.
Breastfeeding parents should consider the potential risks and benefits before taking melatonin supplements. While melatonin may help improve nocturnal sleep for babies, it is not recommended to supplement with this hormone, especially long-term. Strategies such as exercising, sticking to a bedtime routine, and reducing caffeine intake can also help improve sleep for breastfeeding parents.
In summary, breast milk naturally contains melatonin, which may contribute to longer sleep duration in breastfed infants. However, the decision to supplement with melatonin should be made cautiously and in consultation with a healthcare provider, as more research is needed to establish its safety for breastfeeding mothers and their babies.
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Formula consists of casein protein, which keeps babies full for longer
While there is no one-size-fits-all solution for improving baby sleep patterns, formula feeding is often associated with longer stretches of infant sleep and fewer night wakings. This is primarily due to the composition of the formula, which includes casein protein.
Casein protein is harder for infants to digest compared to the proteins found in breast milk. As a result, formula-fed babies may feel fuller for longer, reducing the frequency of their night feedings. The slower digestion rate of formula can lead to longer periods of satiety for babies, contributing to more extended sleep durations.
On the other hand, breast milk is much easier for babies to digest, leading to faster hunger cues and more frequent nursing sessions. Breastfed babies tend to wake up more often during the night compared to formula-fed or combo-fed babies.
However, it is important to note that the benefits of formula feeding in terms of sleep should be considered alongside other factors. For example, while formula-fed babies may sleep longer, the preparation and cleaning process associated with formula feeding adds time before parents can fall back asleep. As a result, breastfeeding parents may accumulate more sleep overall, even with more frequent night wakings.
Additionally, individual variations among babies and families should be considered. While research provides insights into general trends, the specific circumstances and preferences of each family, as well as the unique characteristics of each baby, will influence the chosen feeding method and subsequent sleep patterns.
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Formula increases the risk of an inflammatory response in the gut, which can cause bloating and pain
While some parents report that their babies sleep better after being fed formula, others claim that breastfeeding helps everyone get more rest. Research shows that formula-fed babies wake up less frequently during the night than breastfed babies. This is because formula is harder to digest than breast milk, keeping babies fuller for longer. However, parents who formula-feed take longer to fall back asleep after feeding their babies, as they need to make bottles, mix formula, heat up breast milk, and clean bottles.
Formula feeding has been linked to an increased risk of inflammatory responses in the gut, which can cause bloating and pain. Inflammatory bowel disease (IBD) is an autoimmune disorder that causes inflammation in the intestines. Symptoms of IBD include belly pain, diarrhoea, fever, and the frequent need to use the bathroom, which can disrupt sleep. IBD can lead to other serious medical conditions, such as colon cancer, and increase the risk of certain cancers when treated with immune-suppressing drugs or biologics.
The gut microbiome may play a role in the chronic inflammation associated with IBD. Certain foods and drinks, such as alcohol, caffeinated drinks, carbonated drinks, dairy products, and greasy foods, can worsen IBD symptoms. Smoking cigarettes has also been shown to trigger IBD symptoms and increase the risk of bloating, constipation, and abdominal pain. Additionally, cruciferous vegetables like broccoli, cauliflower, and Brussels sprouts are common causes of bloating due to the presence of hard-to-digest natural sugars.
To prevent bloating, it is recommended to exercise, reduce stress, and avoid swallowing too much air while eating or drinking. Walking or engaging in minimal physical activity after meals can help release trapped gas and reduce bloating. Eating slowly, avoiding gassy foods, and managing portion sizes can also help alleviate bloating and its associated discomfort.
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Separation anxiety and sleep training methods may impact a baby's sleep more than feeding methods
Separation anxiety can impact a baby's sleep patterns and cause difficulties at bedtime. This can manifest as crying, fussiness, or clinginess when the caregiver is initiating separation, such as putting the baby down or leaving the room. Separation anxiety can also lead to shorter naps, night wakings, and struggles with falling asleep. While separation anxiety is a normal part of a baby's developmental growth, it can be challenging for both the child and the caregiver.
To ease separation anxiety and improve sleep, caregivers can employ strategies such as providing extra attention and connection time, maintaining a consistent bedtime routine, and using transitional objects for comfort. Games like Peek-a-Boo and "I'll Be Right Back" can help reinforce the idea that the caregiver will always return, even if they are out of sight temporarily.
Sleep training methods aim to help babies fall asleep independently and improve sleep patterns. These methods can include gentle approaches, such as camping out (where the parent sleeps next to the baby's crib) or parental education about baby sleep. Sleep training does not guarantee that babies will sleep through the night every night, and the effectiveness of these methods may vary.
While sleep training can help reduce resistance to sleep and improve sleep patterns, it may not always lead to long-term success. The scientific literature suggests that gentler approaches are generally effective in improving sleep for babies and parents, at least in the short term. However, it's important to note that sleep training may not work for all babies, and there is no one-size-fits-all solution.
In summary, separation anxiety and sleep training methods can both impact a baby's sleep. While separation anxiety may cause temporary disruptions in sleep patterns, it is a normal and important part of a baby's development. Caregivers can employ strategies to ease separation anxiety and improve sleep. Sleep training methods offer tools to help babies fall asleep independently, but they may not always lead to consistent long-term results. Ultimately, the impact of separation anxiety and sleep training on a baby's sleep may vary, and a personalized approach that considers the unique needs of the baby and family is essential.
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Frequently asked questions
There is no clear answer to this question. While some sources claim that formula-fed babies sleep longer due to the protein casein, which keeps them fuller for longer, others argue that breast milk is easily digested, and breastfed babies will wake up frequently to feed. Additionally, breast milk contains the maternal hormone melatonin, which may help babies sleep longer.
Formula milk may not necessarily help babies sleep longer at night. While formula-fed babies may stay fuller for longer due to the protein casein, it can also increase the risk of an inflammatory response in the gut, causing excess wind, bloating, and pain.
No, this is a common misconception. Medical studies have found no difference in the sleep patterns of babies who received solids before bedtime compared to those who did not.











































