When should you start expanding a baby's diet?
Applies to age: 4–6 months
In short
Complementary foods are introduced from about the 6th month of life; until then, exclusive breastfeeding is recommended. Readiness shows when the child sits, holds the head steady, brings food to the mouth on their own and swallows it.
What is normal
Some claims: international norm
- Around the 6th month of life, an infant's energy and nutritional needs start to exceed what breast milk provides, so additional (complementary) foods are needed.
Source: WHO · international norm – show the original wording (EN)
Summarized and translated by the editors, not an official translation. Verbatim quote from the source, in its original wording:
Around the age of 6 months, an infant’s need for energy and nutrients starts to exceed what is provided by breast milk, and additional (complementary) foods are necessary to meet those needs.
WHO · open the source · accessed: 2026-10-12 · license [1]
- If complementary foods are not introduced around the 6th month of life, or if they are given before this age, the child's growth may slow down.
Source: WHO · international norm – show the original wording (EN)
Summarized and translated by the editors, not an official translation. Verbatim quote from the source, in its original wording:
If complementary foods are not introduced around the age of 6 months, or if they are given before this age, growth may falter.
WHO · open the source · accessed: 2026-10-12 · license [1]
- Complementary feeding, meaning giving foods in addition to milk, usually starts at 6 months of age and continues until the 23rd month of life.
Source: WHO · international norm – show the original wording (EN)
Summarized and translated by the editors, not an official translation. Verbatim quote from the source, in its original wording:
Complementary feeding, defined as the process of providing foods in addition to milk when breast milk or milk formula alone are no longer adequate to meet nutritional requirements, generally starts at age 6 months and continues until 23 months of age.
WHO · open the source · accessed: 2026-10-12 · license [1]
- Introducing solid foods (complementary feeding) should start when the child is around 6 months old.
Source: NHS · international norm – show the original wording (EN)
Summarized and translated by the editors, not an official translation. Verbatim quote from the source, in its original wording:
Introducing your baby to solid foods, sometimes called complementary feeding or weaning, should start when your baby is around 6 months old.
NHS · open the source · accessed: 2026-10-12 · license [2]
- The Patient Portal (Portal Pacjenta) states that it is best to feed the child only breast milk until the 6th month of life.
Source: Portal Pacjenta – show the quote
Verbatim quote from the source:
Polish original
Najlepiej, jeśli matka karmi maleństwo wyłącznie swoim mlekiem do 6 miesiąca życia.
Portal Pacjenta · open the source · accessed: 2026-10-12 · license [3]
- After the 6th month, the child should be fed mom's milk and complementary foods that gradually enrich the diet, at least until the age of 2.
Source: Portal Pacjenta – show the quote
Verbatim quote from the source:
Polish original
Potem, przynajmniej do 2 lat, maluch powinien być karmiony mlekiem mamy i uzupełniającymi pokarmami, które sukcesywnie wzbogacają jego dietę.
Portal Pacjenta · open the source · accessed: 2026-10-12 · license [3]
- Infant formula is not a complementary food.
Source: gov.pl – show the quote
Verbatim quote from the source:
Polish original
Uwaga: Mleko modyfikowane nie jest pokarmem uzupełniającym.
gov.pl · open the source · accessed: 2026-10-12 · license [4]
- Three clear signs, when they appear together from around the 6th month of life, show that the child is ready for first solid foods alongside milk.
Source: NHS · international norm – show the original wording (EN)
Summarized and translated by the editors, not an official translation. Verbatim quote from the source, in its original wording:
There are 3 clear signs which, when they appear together from around 6 months of age, show your baby is ready for their first solid foods alongside breast milk or first infant formula.
NHS · open the source · accessed: 2026-10-12 · license [2]
- One of the signs of readiness is the ability to sit and hold the head steady.
Source: NHS · international norm – show the original wording (EN)
Summarized and translated by the editors, not an official translation. Verbatim quote from the source, in its original wording:
stay in a sitting position and hold their head steady
NHS · open the source · accessed: 2026-10-12 · license [2]
- One of the signs of readiness is coordination of eyes, hands and mouth, so that the child looks at the food, picks it up and puts it in the mouth on their own.
Source: NHS · international norm – show the original wording (EN)
Summarized and translated by the editors, not an official translation. Verbatim quote from the source, in its original wording:
co-ordinate their eyes, hands and mouth so they can look at the food, pick it up and put it in their mouth by themselves
NHS · open the source · accessed: 2026-10-12 · license [2]
- One of the signs of readiness is swallowing food instead of spitting it back out.
Source: NHS · international norm – show the original wording (EN)
Summarized and translated by the editors, not an official translation. Verbatim quote from the source, in its original wording:
swallow food (rather than spit it back out)
NHS · open the source · accessed: 2026-10-12 · license [2]
The sources in our registry do not say when to see a doctor.
Myths
False Myth: “Introducing solid foods will make the infant sleep through the night more often.”
Why it is wrong. Starting solid foods does not increase the chances that the child will sleep through the night.Source: NHS – show the original wording (EN)
Summarized and translated by the editors, not an official translation. Verbatim quote from the source, in its original wording:
Starting solid foods will not make your baby any more likely to sleep through the night.
NHS · open the source · accessed: 2026-10-12 · license [2]
international norm “International norm” next to a section heading means its claims come from a non-Polish source, because no Polish source in our registry covers this topic. When this applies to only some of the claims, the foreign ones carry the same label next to their source.
Sources
- WHO (who.int)
- https://www.who.int/news-room/fact-sheets/detail/infant-and-young-child-feeding
- https://www.who.int/publications/i/item/9789240081864
License: CC BY-NC-SA 3.0 IGO. Source: WHO (who.int). Content summarized and translated by the editors; changed relative to the original. WHO does not endorse this site or its content. - NHS (nhs.uk, Anglia)License: Open Government Licence v3.0. Source: NHS (nhs.uk, Anglia). Content summarized and translated by the editors; changed relative to the original. Contains public sector information licensed under the Open Government Licence v3.0. The summary is ours and is not attributed to the NHS.
- Portal Pacjenta (pacjent.gov.pl)License: CC BY 3.0 PL. Source: Portal Pacjenta (pacjent.gov.pl). Content summarized and translated by the editors; changed relative to the original.
- gov.pl – serwisy Ministerstwa Zdrowia i GISLicense: CC BY-SA 4.0. Source: gov.pl – serwisy Ministerstwa Zdrowia i GIS. Content summarized and translated by the editors; changed relative to the original.