Rider-matched picks
Size-matched gloves picks for small children (ages 3–5), with fit and feature priorities curated for how small children (ages 3–5) actually ride.
Verified on Amazon today — prices and availability may vary.

Diamondback
Adult half-finger glove sized by hand circumference — most riders fall in the M-L range.

Woom
Sized XS-XL by hand circumference. Multiple colorways available on the parent listing.
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For small children, bike size is determined by wheel diameter — not frame size. At this age, the priority is confidence and safety over performance. Your child should be able to touch the ground flat-footed when seated at the lowest saddle position. A bike that's too large is dangerous — children cannot control bikes they can't reach the ground from. Consider starting with a balance bike (no pedals) for children under 4, as this teaches balance and steering before adding pedal complexity. For pedal bikes, look for models with coaster brakes (backpedal to stop), which are easier for small hands than hand brakes. Bike weight matters enormously at this age — a bike that weighs more than 30% of the child's body weight will be hard to control. Expect to replace the bike every 1–2 years as your child grows.
Measure hand circumference at the widest point across your palm, just below the knuckles, with the tape snug but not compressing the hand. Exclude the thumb. Most brands size: XS 6–7", S 7–7.5", M 7.5–8", L 8–9", XL 9–10". Italian brands (Castelli, Sportful) often run a half-size small; US brands (Giro, Pearl Izumi) size true. Kids gloves are usually sold by age band — XS (3–5 yrs), S (5–7), M (7–10), L (10–13) — but always cross-check against the brand's circumference chart because hand size varies more than age does.