This age

What a baby senses

Each sense sharpens on its own schedule. Here is what is typical at this age.

See like this babyHear like this baby

Things to try together

All activities and words →

More about this age

Thinking, social and movement
The numbers behind this page

Brain-response measures give higher sharpness values than looking tests such as acuity cards. Both are shown so you can see the spread.

Where this comes from

Seeing: Norcia & Tyler 1985, Banks & Bennett 1988 and acuity-card norms. Thinking and social: Spelke, Baillargeon, Hamlin and colleagues. Language: Werker & Tees 1984, Mandel et al. 1995, Bergelson & Swingley 2012. Ages 15 to 24 months follow the CDC/AAP milestone checklists (Zubler et al. 2022).

A simulation built from published averages for groups of babies, not a medical test. If you are worried about a baby's seeing, hearing or development, talk to a paediatrician or health visitor.