Here's a quick and dirty method to recall developmental milestones

See the zero
0 as the "o" in tone, as the eyes for gaze, and as the mouth for strong suck
The word
two (months) is a combination of
track and c
oo
At
four, the baby finds things
funny (laughs) and pushes up on
forearms to roll
At
six, the baby
sits and makes
sounds
Picture the number
9 in a standing position and making a pincer grasp
The w in t
welve is for
words and
walks
At
2 years old, the child has
2-word sentences and runs on
2 legs