6 Month Old Milestones: What to Expect and What to Watch For

Six months is a landmark moment in a baby's first year. Your baby has doubled their birth weight, discovered their feet, is on the verge of sitting independently, and is becoming a genuinely social little person with opinions and preferences. Here's a comprehensive look at what typical development looks like at 6 months — across all domains.

Motor Milestones at 6 Months

Motor development is often the most visible domain of milestone tracking. At 6 months, expect:

Gross Motor

• Sitting with support: Most 6-month-olds can sit in a high chair or with hands propped in front (tripod sitting). Independent sitting — no hands needed — typically comes around 7–9 months.
• Rolling both ways: Back-to-front and front-to-back rolling is well established for most babies by 6 months. Some babies prefer one direction at first.
• Weight bearing on legs: When held upright, most 6-month-olds will push down with their feet and enjoy "standing" with support.
• Pivoting during tummy time: Many babies begin to pivot in a circle on their tummy, a precursor to crawling.

Fine Motor

• Reaching and grasping: Babies can now intentionally reach for and grasp objects, typically with a raking grasp (using all fingers rather than a pincer grip)
• Transferring objects: Most 6-month-olds can pass an object from one hand to the other
• Everything goes in the mouth: Oral exploration is a primary learning tool — completely normal and expected

Language Milestones at 6 Months

Language development at 6 months is more about input and early babbling than output. Here's what's typical:

• Babbling: Consonant-vowel combinations (ba, da, ma, ga) should be emerging by 6 months
• Turn-taking in "conversation": Babies pause and wait for your response, then "reply" — this is proto-conversation
• Responds to name: Most babies reliably turn toward their name by 6 months
• Distinguishes between happy and upset tones: Your baby can read your emotional tone even before understanding words
• Vocalizes to express pleasure and displeasure: Different sounds for different emotional states

Social-Emotional Development at 6 Months

Six months is when the social world really opens up. Attachment is deepening, and your baby is becoming a much more intentional social partner.

• Strong preference for primary caregivers: Your baby knows you and prefers you — this is the foundation of secure attachment
• Beginning of stranger anxiety: Some babies show wariness around unfamiliar people as early as 6 months; for most, it peaks around 8–12 months
• Rich emotional expression: Laughing, squealing, crying, frustration, delight — your baby now has a full emotional repertoire
• Reciprocal play: Your baby enjoys and initiates games like peek-a-boo

Cognitive Development at 6 Months

The 6-month brain is rapidly developing. Key cognitive milestones include:

• Beginning of object permanence: Your baby may start to look for objects that fall out of sight — though this doesn't fully develop until 8–9 months
• Cause and effect: Discovering that actions produce results (shake rattle = sound, press button = music)
• Memory: Recognizes familiar objects, people, and routines
• Exploration: Actively investigates objects by mouthing, shaking, banging, and looking at them from different angles

Starting Solids at 6 Months

Six months is the AAP-recommended time to begin introducing solid foods. Your baby's readiness signs — sitting with minimal support, good head control, interest in food, and loss of the tongue-thrust reflex — should all be present before starting.

Start with 1–2 teaspoons once daily. Iron-rich foods (meat, lentils, iron-fortified cereals) are a priority for breastfed babies. Introduce the top allergens early and individually. There is no required "first food" — offer a variety from the beginning.

See our complete guide: When to Start Solid Foods.

Sleep at 6 Months

Six months is often a turning point for sleep:

• Total sleep: 13–15 hours per 24-hour period
• Night sleep: 10–12 hours (with 0–2 wakings for most babies)
• Naps: Most 6-month-olds take 2–3 naps per day, totaling 2.5–4 hours
• Wake windows: 2–2.5 hours

The 6-month mark is also when sleep training, if desired, is appropriate. Many babies are developmentally ready to sleep through the night (without nutritional need for overnight feeds) around this age.

Red Flags at 6 Months

Talk to your pediatrician if your 6-month-old: