Milestones

Developmental milestone can be hard, especially if u dnt have kids 

Gross Motor
2 lifts head
4 front to back 5 back to front ( just think back to front is more muscle)
6 imagine the "6" as baby sitting
9 number "9" doesnt have good base so crawls
11 "11" has 2 good base so baby is able to stand/cruise/walk
12 now good base plus 2 legs can walk for sure (alone)
15 "5" is mirror image of "2" so baby can walk backwards
2yr u need to use both legs to go up/down stairs
3 "TRI-cycle"
4 HOPS 4 letters

Fine Motor
"9ince12" = PINCER Before pincer comes raking which is more immature
9 mo = non specific ( 3 finger) also nonspecific mom and dad
12 mo = specific (2 fingers) also specific mom and dad 
15 mo = 2block
18 = 3blocks
2yr = 6 blocks 
Also playstation controler 0 --> X --> Square --> triangle 3 4 5 6 yrs

Language/social
2 coos and smiles because recognizes parents.
4 coos and laughs
6 babbles and anxiety, because recognizes strangers
1 yr alone so plays ALONE/ follow ONE step command, One word besides mom dad
2 yrs now 2 so PARALELL play, follows TWO step command, 2 word PHRASES
3 4 5 6 number of sentences with years
Bowel control at 4 Pee control at 5 

Birthweight x 2 every 6mo/ 1 yr Then x2 the next year = so x4 by 2yrs 
Lenght doubles every 4 yrs so x4 by puberty

Reflex
Palmar is first to come ( US baby always has his palm close) 
Rooting is first to go 
Parachute always stays