Baby at 6 Months: Starting Solids, Sitting, Key Vaccines

Your baby's world gets bigger this month First taste · First sit · First syllables — six months is the start

Six months is a major turning point — time to introduce solids per WHO [1], and a leap forward in motor, vision, and communication skills.

This article draws on WHO [1], AAP [2] [3], and the Department of Health, Thailand [4].

Milestones at 6 months

Per AAP [3]:

Motor

• Sits without support — may still tip slightly at first
• Rolls over in both directions
• Pushes up on extended arms during tummy time
• Transfers objects from one hand to the other
• Reaches with both hands — more accurate grasp

Communication

• Babbles in repeated syllables — "ba-ba", "ma-ma"
• Turns to their name
• Expresses emotion through sound — laughter, excitement, anger
• Imitates sounds that you make

Vision

• Sees colors clearly
• Tracks faster-moving objects at varied distances
• Recognizes familiar faces and may show stranger anxiety

Social

• Responds to others' emotions — smiles when you smile
• Plays simple games like peek-a-boo
• Shows attachment — clear preference for caregivers

Starting solids at 6 months

WHO [1] and AAP [2] recommend introducing solids at 6 months while continuing breastfeeding through 2 years or beyond.

Signs your baby is ready

• Sits with or without support, head steady
• Shows interest in food — watches what you eat
• Tongue-thrust reflex has faded — doesn't push food out with tongue
• Opens mouth for the spoon
• Has roughly doubled birthweight

How to introduce

• Start with soft, finely mashed foods mixed with breast milk or vegetable broth
• One new food at a time, wait 3 days before adding another — watch for allergies
• Gradually increase texture from purees → mashed → finely chopped → soft chunks
• Offer before milk at meal times; nurse afterwards
• No salt, sugar, or seasoning before age 1
• No honey before age 1 — risk of Infant Botulism

Recommended food groups

Per the Department of Health, Thailand [4]:

• Mashed rice — rice porridge with broth, often a first food
• Leafy greens — finely mashed
• Root veg and fruits — pumpkin, carrot, sweet potato, ripe papaya, banana
• Egg yolk at 6 months; whole egg (with white) at 7–8 months
• Liver and meat — chicken liver, fish, chicken — key sources of iron and zinc
• Fish — choose low-mercury species like tilapia
• Legumes and grains — mashed soybeans, sesame

Foods to avoid before age 1

• Honey — Infant Botulism risk
• Cow's milk as a primary drink — but in cooked foods, yogurt, cheese is fine
• Salt and sugar — infant kidneys can't handle high sodium
• Small round hard foods — whole nuts, whole grapes, hard candy, popcorn — choking hazards
• High-mercury fish — shark, swordfish, yellowfin tuna

Key vaccines at 6 months

Per Thailand's EPI schedule [5]:

• DTP-HB-Hib3 — third dose of the 5-in-1
• OPV3 — third oral polio
• IPV — injectable polio
• Rota3 (if using a 3-dose schedule)
• Influenza — first dose now eligible (optional but recommended)

Warning signs to flag

• Not sitting at all by 8–9 months, or not rolling
• Not vocalizing or not babbling
• No response to sound or name
• Muscle tone unusually stiff or floppy
• Failure to gain weight or weight loss
• Food allergy signs — full-body rash, breathing difficulty, swelling, vomiting
• Anaphylaxis — go to the ER immediately

Summary

Six months is when the world opens up — new flavors, textures, and freedom of movement.

Key principles this month:

1. Start solids at 6 months exactly — not earlier, not later
2. One new food, wait 3 days to spot allergies
3. Continue breastfeeding through age 2 or beyond
4. Iron-rich foods first — liver, egg yolk, leafy greens to prevent anemia
5. Vaccines on schedule — DTP-HB-Hib3 + OPV3 + IPV

If you're worried about milestones — not sitting, not vocalizing, not responding — talk to your pediatrician. Early detection of developmental delays leads to better outcomes.