23 - Developmental Milestones - part 1

line	2 years
circle	3 years
square	4 years
rectangle	4 years
plus	4 years
Triangle	5 years
Cross	5 years

Tip-toe walking	2.5 years
Hopping	4 years
Skipping	5 years

3 months	Cooing
6 months	Monosyllables ( ma , ba )
9 months	Bisyllables ( mama , baba )
12 months	Two words with meaning
18 months	Ten words with meaning
24 months	2 or 3 simple sentences
36 months	Telling story ( 250 words vocabulary )

Just some additional information :

0-1 year        = infancy
2-3 years      = toddler
3-6 years      = preschool age
6-12 years     = school age
12 - 20 years = adolesence