| At… | Most Babies Will... | Some Babies Can... | A Few Babies May... |
| 1 Months | - Respond to a sound, like a bell - Focus on faces - Lift their head |
- Follow an object held several inches in front of their face - Make sounds other than crying, like cooing - Smile when you smile |
- Laugh - Smile on their own - Follow an object from side to side (180°) |
| 2 Months | - Hold their head up for a few seconds - Follow an object - Coo and gurgle |
- Hold their head up at a 45° degree angle - Concentrate on a small object, like a pea - Roll over in one direction |
- Lift their head and chest off of the floor - Bring their hands together - Lift their head 90° |
| 3 Months | - Laugh - Hold their head steady - Squeal in pleasure |
- Recognize your voice - Hold a rattle when it is placed in their hand - Support their lifted chest with their arms |
- Bear some weight on their legs - Reach for toys - Turn towards loud sounds |
| 4 Months | - Support their lifted chest with their arms - Hold upright head steady - Respond when you talk with coos and gurgles |
- Roll over in one direction - Keep head up when pulled to a sitting position |
- Sit unsupported - Imitate sounds - Protest if you take a toy away |
| 5 Months | - Roll over in one direction
- Play with their hands and feet - Reach for an object - Bear some weight on their legs |
- Turn toward a voice or new sound - Know their own name - Sit unsupported |
- Pull-up to standing from sitting - Babble - Be afraid of strangers |
| 6 Months | - Sit unsupported - Turn toward a voice - Roll over in both directions |
- Protest when a toy is taken away - Pass an item from hand to hand - Be ready for solids |
- Pick up very small objects with their thumb and finger - Start crawling - Say "mama" or "dada" although not to the correct parent |
| 7 Months | - Imitate speech sounds - Try to get toys that are out of reach - Look for a dropped object |
- Stand while holding onto something - Crawl |
- Wave bye-bye - Play patty-cake - Bang things together |
| 8 Months | - Eat a cookie unassisted - Crawl - Pass an item from hand to hand |
- Crawl well - Point to an object - Say "mama" or "dada" although not to the correct parent |
- Walk while holding onto furniture (cruise) - Understand "no" - Gesture to what they want |
| 9 Months | - Stand while holding onto something - Play Peek-A-Boo - Say "mama" or "dada" although not to the correct parent |
- Play Patty Cake - Cruise - Understand "no" |
- Say "mama" or "dada" to correct parent - Drink from cup alone - Stand on their own |
| 10 Months | - Pick up items with thumb and finger - Wave bye-bye - Understand "no" |
- Gesture to what they want - Stand on their own - Say "mama" or dada" to correct parent |
- Stand freely for a few seconds - Stand alone well - Walk |
| 11 Months | - Say "mama" or dada" to correct parent - Stand alone momentarily - Play Patty Cake |
- Say one word aside from "mama/dada" - Put an item in a container - Understand basic directions |
- Stoop down from a standing position - Walk well - Say three or more words aside from "mama/dada" |
| 12 Months | - Gesture to what they want - Say one word aside from "mama/dada" - Imitate others |
- Walk - Roll a ball back to you |
- Scribble - Pick up an object while standing |
