According to the American Academy of Pediatrics, these are the most significant milestones to keep an eye out on. However, keep in mind that babies vary on exact milestone timelines. If you have any concerns about your baby's development, consult your pediatrician.

1. EYE CONTACT

(6 - 8 weeks)
This first milestone lets you know that your infant's on track.

2. SMILE

(6 - 8 weeks)
Not to be confused with a smile related to digestive gas, a genuine smile happens in response to someone else's smile.

3. COOING

(8 weeks)
Sweet little sounds like "ooh" and "ahh" start happening spontaneously.

4. BABBLING

(3 - 4 months)
Cooing expands when Baby starts to use his tongue. At 6 - 8 months, Baby will start babbling back to you.

5. REACHING & GRABBING

(5 - 7 months)
Using hands and arms, Baby shows an interest in touching and holding. Create opportunities for this.

6. ROLLING OVER

(5 months +)
At this age, Baby will lift his head, push up on his arms and try rocking. Using his head and arms in a "mini" push up, he will amaze you when he flips from front to back.

7. SITTING UP

(5 months +)
Sitting for a few minutes without support comes next (once there's total head control).

8. CRAWLING

(7 - 10 months)
Babies have different styles in this department, scooting on the bottom or pushing off on the tummy by the knees.

9. PULLING UP

(9 months +)
All of the sudden your baby has the muscle development he needs to pull himself up to a standing position. Big boy!

10. WALKING

(9 - 15 months)
Your baby will sit, roll over and crawl before moving from pulling up to walking. Once a baby progresses to walking, well, welcome to independence!