Most babies are born with flat feet and develop arches as they grow. But in some kids the arch never fully develops. Being flat-footed usually isn't a cause for concern and shouldn't interfere with playing sports. Sometimes, doctors will recommend inserting arch supports into shoes to ease foot pain.
Babies may have a natural turning in of the legs until they begin standing. But as they get older, some might walk with feet turn inward. In-towing usually doesn't interfere with walking, running, or sports, and often ends on its own as kids grow into teens.
Toe walking is common among toddlers as they learn to walk. It often goes away by age 2, but lasts in some kids. If an otherwise healthy child keeps toe walking, doctors might recommend physical therapy to learn stretching exercises.