9 months
Sitting up by themselves
Crawling
Babbling
Can distinguish (and be cautious of) strangers
Listens
(Red flag if neither of first 2 by 12 months)
12 months
Stand + cruise
Speak single words in context (e.g Dada)
Engage with others
Hold a crayon
Follow instructions
Red flag if none of top 3 by 18 months
2 years
Runs (uses 2 feet)
Copies vertical lines (2 parallel lines)
Parallel plays (2 children playing together)
Combines 2 words
Red flag if can’t run by 2.5 years