When to Start Solids: The Signs Your Baby Is Ready

When should a baby start solids?

The headline number is six months. The WHO recommends only breast milk for the first six months and complementary foods from around six months; the NHS says around 6 months old; the American Academy of Pediatrics says approximately 6 months.

But the number stands in for something else — whether your baby can physically manage food. Those skills arrive on their own schedule, so the signs below matter more than the date. It is also why a decision made at home beats one made in a supermarket aisle, holding a jar labeled "4 months+".

What are the signs a baby is ready for solids?

The NHS names three, and is specific that they appear together, from around six months — not one at a time, and not one out of three. The AAP adds a fourth.

• Sitting steadily with head control. Staying in a sitting position and holding their head steady. The AAP frames it as sitting in a high chair, feeding seat or infant seat with good head control, so the seat can do some of the work.
• Hands, eyes and mouth working together. Looking at a piece of food, picking it up, and getting it into their own mouth unaided. The NHS counts this as one sign rather than three, and it is what separates readiness from general curiosity.
• Swallowing rather than pushing food back out. Young babies have a reflex — tongue thrust — that sends solids straight out again. The AAP describes the test plainly: if food comes out and dribbles onto the chin, your baby can't yet move it to the back of the mouth to swallow.
• Actively wanting it. The AAP lists watching you eat, reaching for your food and seeming eager to be fed. This one is weak on its own and convincing next to the reach and grab.

Which signs look like readiness but aren't?

Most early starts trace back to this list. Every item is ordinary behavior for a five-month-old. The NHS names the first three as things parents mistake for readiness, and Ireland's HSE lists all four.

• Waking more at night. The NHS also tests the hope underneath it: starting solid foods will not make your baby any more likely to sleep through the night.
• Chewing their fists. This is how babies investigate everything at this age.
• Wanting extra milk feeds, or seeming hungrier. Appetite moves around on its own.
• Getting fussier. The HSE names increased fussiness too, and sums the whole list up — these are normal baby behaviors, and they do not mean your baby is hungry or ready for solid food.

Two more are worth naming because guidance genuinely differs on them. On watching you eat, the AAP counts it among the signs, while the NHS and HSE define the sign as getting food to the mouth, which arrives months after watching does. On size, the AAP mentions babies who have doubled their birth weight and weigh about 13 pounds; the NHS and HSE use no weight criterion at all. Neither treats being a big baby as a reason to start early on its own.

Why does some advice say four months, and some six?

Guidance	When to start solids
World Health Organization	Breast milk only for the first six months, then complementary foods from around six months
NHS (UK)	Around 6 months, when the three signs appear together
American Academy of Pediatrics	Approximately 6 months
ESPGHAN, the European pediatric nutrition society (2008)	Not before 17 weeks, and all infants by 26 weeks
HSE (Ireland)	Never before 17 weeks (4 months)

ESPGHAN is the one that sets a window instead of a date, and the window runs from roughly four months to six. It has been challenged: a 2011 review in Maternal & Child Nutrition argued the window rests on weak evidence, and the WHO's advice stayed at six months.

The disagreement is about the earliest acceptable point, not the destination — every one of them has solids under way by six months. And nothing recommends starting before 17 weeks. The HSE states it flatly: do not start your baby on solid food before they are 17 weeks (4 months) old.

If your baby was born early, this runs on corrected age — their age minus the weeks or months they arrived early. The HSE puts readiness at around a corrected age of five to six months, and the NHS asks you to work the timing out with a health professional rather than alone.

When should you ask a doctor before starting?

• Your baby was born prematurely — the NHS says to ask a health professional for advice on when to start.
• Your baby has reached a corrected age of seven months and still isn't showing the readiness signs. The HSE names this exact point as one to raise with your doctor or nurse.
• Someone has suggested starting before six months for a medical reason. No guidance supports starting before 17 weeks, so make that call with a clinician rather than on advice passed along.
• Your baby has a known food allergy, or allergies are worrying you — the HSE lists this as a reason to get advice first.
• You're planning a vegetarian or vegan diet for your baby, which the HSE also flags as one to plan with a professional.
• Feeding or swallowing has already been hard work. Ask before you start, not after.