Developmental milestones

2 months www.cdc.gov/ncbddd/actearly/milestones/milestones-2mo.html
​4 months www.cdc.gov/ncbddd/actearly/milestones/milestones-4mo.html
6 months www.cdc.gov/ncbddd/actearly/milestones/milestones-6mo.html
​9 months www.cdc.gov/ncbddd/actearly/milestones/milestones-9mo.html
​1 year www.cdc.gov/ncbddd/actearly/milestones/milestones-1yr.html

18 months www.cdc.gov/ncbddd/actearly/milestones/milestones-18mo.html
2 years https://www.cdc.gov/ncbddd/actearly/milestones/milestones-2yr.html
3 years www.cdc.gov/ncbddd/actearly/milestones/milestones-3yr.html
4 years www.cdc.gov/ncbddd/actearly/milestones/milestones-4yr.html
5 years www.cdc.gov/ncbddd/actearly/milestones/milestones-5yr.html