Lift head
2 months
Lift body and head (roll over )
4 months
Sit up
6 months
Cruise
1 yr
Take steps up and down stairs
2 yrs
Hopping
4 yrs
5 yrs
Skipping
Social smile
2 months
Stranger anxiety
6 months
Separation anxiety
1 yr
Circle
3 yrs
Cross
4 yrs
Triangle
5 yrs