New research claims that giving babies solid foods at just three months old will help them sleep. Though this may sound appealing to exhausted new parents, unfortunately there is a large gulf between the headlines and the data.
What and how much baby eats has nothing to do with how well they sleep
Much of the published evidence in this area actually shows the opposite, that what a baby eats has nothing to do with their sleep.
In 2015 we found that neither breast nor formula milk, timing of solids introduction, nor the amount of solids eaten affected how often babies woke up at six to 12 months.
Another study has found that the common practice of adding rice cereal to a bottle before bed (which should be avoided as it can cause choking) has no impact on sleep at four months old.
While a third found that early introduction of solids was associated with less sleep at 12 months old.
The recent study is an excellent example of how statistically significant differences and real-world differences can be miles apart. The authors themselves note that no difference in waking was seen until 5 months old, despite one group having solids from 3 months.
From then, babies in the early introduction group may have technically slept more, but this amounted to an average of just 7 minutes more a night. At its maximum (6 months old) the difference was 16 minutes. Most babies in the study still woke up once or twice a night whatever they were fed.
And given these figures are based on the self-reporting of sleep deprived parents – which often does not match up to sleep recordings – this is not a basis for making major changes in infant feeding practices.
- Also read: Feeding your newborn solids? Stop right now!
Why solid foods aren't the answer to help baby to sleep
There is no physiological reason why introducing solid foods early would help a baby sleep.
First, babies (after the first few weeks) do not simply wake at night because they are hungry. Just like adults, they wake because they are cold, uncomfortable or simply want comfort. The difference being that they cannot always soothe themselves back to sleep.
Second, even if it were for hunger, the most sensible solution would be to offer additional milk, as it will give more energy, fat and protein than any other food you can give a baby.
What the trial actually measured
The aim of the trial from which this data came was not to increase overall energy intake, but to test how introduction of allergenic foods at three versus six months affects the development of allergies (which it did not).
The parents were advised to give very small amounts of allergenic foods (such as one egg, 25g fish and 100g yogurt spread over a week – just a few spoonfuls a day) alongside rice, cereals, fruit and vegetables. All of these foods are lower in calories than breast or formula milk but take up more room, meaning babies might even eat a little less as they get used to weaning – a potential explanation for the larger sleep gap at 6 months as the standard group got used to food.
- Also read: 8 signs your baby may be ready for solids
Early food isn't a good idea, full stop
Less than half of the parents in the early introduction group stuck to the protocol. A variety of reasons were given but a major issue with introducing solids early is that babies are simply not physiologically ready. At three months, many may only just have good head control. They won’t be able to sit up properly. They still have a gag reflex that pushes food out of their mouth. Earlier introduction of solids can be messy, time consuming and demoralising, as babies simply aren’t equipped to be eating solids so soon.
Research shows that the earlier a baby is weaned, the longer it takes them to eat anything other than a few tastes. One study found if babies were given solids before 4 months it took them 6 weeks on average to eat just 100ml of food per day, but it was just 12 days for those weaned at the recommended 6 months.
- Also read: 10 of the best ways to start solids
The guidelines to introduce solid foods at 6 months are there for good reason. There is no deficit to growth or nutrient status in waiting until 6 months to introduce solid foods, but there is an increased risk of gastrointestinal and respiratory illnesses in infants given solid foods before then.
Introducing solids too early can lead to a reduction in breastmilk intake (and its associated antibodies), introduction of contaminants, and can cause digestive difficulties as babies do not develop all the enzymes needed to properly digest solid foods until between 4 and 6 months old.
It should also be noted that the babies in the study were a very specific group. Nearly all were breastfed until 6 months old – 97%, compared to just 34% in the UK population. Research shows that breastfeeding through introduction to solid foods is important in reducing allergy development, but often early introduction of solids increases risk of stopping breastfeeding.
Great care must be taken in generalising these findings. The research begs the question, does introducing solids early – with all its associated risks – really carry more weight if it comes with a few minutes of sleep every night? It seems to me that we should be asking why parents are struggling with sleep so much and seek better ways to support them instead.
At which age did you introduce your baby to solids? Did you give your baby solids earlier rather than later? Did it help them sleep? Tell us by emailing firstname.lastname@example.org and we may publish your comments. Do let us know if you'd like to remain anonymous.
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