Baby acne appears as small red or white bumps on face (cheeks, forehead, chin). Develops around 2-4 weeks old, caused by maternal hormones still in baby's system. Looks like teenage acne but smaller. Completely normal and common (affects 20-40% of newborns). Usually resolves on its own by 3-4 months without treatment or scarring. Not caused by poor hygiene.

Baby nails grow surprisingly fast and are sharp - can scratch face easily. Newborns often need nails trimmed 1-2 times per week. Baby nails are soft and flexible, making them tricky to cut. Attached to skin closer than adult nails, so easy to accidentally nick skin. Best time to trim: When baby is sleeping or right after bath (nails softer). Use baby nail clippers or emery board.

Birthmarks are very common - about 80% of babies have some type. Most are harmless and don't need treatment. Common types: Mongolian spots (blue-gray patches, common on darker skin tones, fade by school age), Stork bites/Salmon patches (pink patches on eyelids, forehead, neck - fade by age 2), Café au lait spots (light brown, usually permanent but harmless), Strawberry hemangiomas (bright red raised bumps, grow first year then shrink), Port wine stains (flat pink-red marks, usually permanent). Most birthmarks are just cosmetic. Some types (hemangiomas near eyes/airways, multiple café au lait spots) need monitoring.