Track your baby's milestones, month by month.
Tick off the CDC milestone checklists and keep your own firsts. Free on iPhone, Android and the web.
Early access while we finish the launch
Baby milestones by month
Developmental milestones are things most children (75% or more) can do by a certain age. HiLo Baby shows the checklist for your baby's age, and you tick what you've seen.
2 months
- Calms down when spoken to or picked up
- Looks at your face
- Seems happy to see you when you walk up to them
4 months
- Smiles on their own to get your attention
- Chuckles (not yet a full laugh) when you try to make them laugh
- Looks at you, moves, or makes sounds to get or keep your attention
6 months
- Knows familiar people
- Likes to look at self in a mirror
- Laughs
9 months
- Is shy, clingy, or fearful around strangers
- Shows several facial expressions, like happy, sad, angry, and surprised
- Looks when you call their name
1 year
- Plays games with you, like pat-a-cake
- Waves "bye-bye"
- Calls a parent "mama" or "dada" or another special name
15 months
- Copies other children while playing, like taking toys out of a container when another child does
- Shows you an object they like
- Claps when excited
All 13 on the CDC's 15 months checklist (opens in a new tab)
18 months
- Moves away from you, but looks to make sure you are close by
- Points to show you something interesting
- Puts hands out for you to wash them
All 15 on the CDC's 18 months checklist (opens in a new tab)
2 years
- Notices when others are hurt or upset, like pausing or looking sad when someone is crying
- Looks at your face to see how to react in a new situation
- Points to things in a book when you ask, like "Where is the bear?"
30 months
- Plays next to other children and sometimes plays with them
- Shows you what they can do by saying, "Look at me!"
- Follows simple routines when told, like helping to pick up toys when you say, "It's clean-up time."
All 15 on the CDC's 30 months checklist (opens in a new tab)
3 years
- Calms down within 10 minutes after you leave them, like at a childcare drop off
- Notices other children and joins them to play
- Talks with you in conversation using at least two back-and-forth exchanges
4 years
- Pretends to be something else during play (teacher, superhero, dog)
- Asks to go play with children if none are around, like "Can I play with Alex?"
- Comforts others who are hurt or sad, like hugging a crying friend
5 years
- Follows rules or takes turns when playing games with other children
- Sings, dances, or acts for you
- Does simple chores at home, like matching socks or clearing the table after eating
Your own firsts
Add the moments no checklist has, like a first laugh or a first tooth. HiLo Baby keeps the date, and your partner sees it on their phone.
For a baby born early
Set the due date, and the checklists use your baby's adjusted age until 2 years, as the CDC suggests for a baby born more than 3 weeks early.
If you're worried
You know your child best. Don't wait. If your child is not meeting one or more milestones, has lost skills they once had, or you have other concerns, act early. Talk with your child's doctor, share your concerns, and ask about developmental screening.
Learn the Signs. Act Early. materials are not a substitute for standardized, validated developmental screening tools. HiLo Baby keeps track of what you tick and gives no medical advice.
Where the checklists come from
Milestones and tips from the Centers for Disease Control and Prevention's "Learn the Signs. Act Early." program, available at no charge at cdc.gov/ActEarly.
HiLo Baby is not affiliated with CDC. Use of this material does not imply endorsement by CDC, HHS or the United States Government.
- Price
- Free
- Checklists
- CDC, 2 months to 5 years
- Your own
- Firsts, with the date they happened
- Born early
- Uses adjusted age with a due date
- Your partner
- Sees every tick and first
- Works on
- iPhone, Android and the browser
Questions about milestones
Where do the milestones come from?
From the CDC's "Learn the Signs. Act Early." checklists, for 2, 4, 6, 9, 12, 15 and 18 months and 2, 2½, 3, 4 and 5 years. Each age links to its checklist on cdc.gov. HiLo Baby is not affiliated with CDC.
Can I track baby firsts that aren't on the checklist?
Yes. Add your own, like a first smile, and HiLo Baby keeps the date it happened.
Does my partner see the milestones I tick?
Yes. Ticks and firsts are part of the shared log, so everyone in it sees them on their own phone.
My baby was born early. Which age does it use?
If you set a due date, the checklist uses your baby's adjusted age, as the CDC suggests for babies born more than 3 weeks early.
Does HiLo Baby tell me if my baby is behind?
No. HiLo Baby keeps track of what you tick. It isn't medical advice or a screening tool. If you're worried about your baby, talk to your doctor.
Is the milestone tracker free?
Yes. The checklists, your own firsts and the milestone notes are free, on iPhone, Android and the web.
This month Tick the first one tonight.
Free on iPhone, Android and the web.
Early access while we finish the launch