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What suits this age?
Activities that match what a baby of this age can sense and do. Tap one to see what it takes.
"Likely ready" means every ability the activity needs is typical by this age; "Emerging" means they are on their way. Trying an activity early does no harm: babies show you what they enjoy.
Does a baby this age understand a word?
Where the word ages come from
Rough tiers in the spirit of large parent-report studies (Wordbank; Frank et al. 2021) and lab tests of early word knowledge (Bergelson & Swingley 2012). They differ between languages and families.
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.