Ay, I'd say around 6 months pa lang kailangan natin maging extra careful, hindi fully ready ang kanilang skin para sa direct sun, kaya usually recommended na iwasan ang prolonged sun exposure until 1 year old, or at least limit it to early morning or late afternoon lang. Best to ask your pedia about it since every baby's skin is different, pero general rule na we follow is shade first, sunscreen (if pedia approves) second, at long sleeves/hat kung unavoidable talaga ang sun exposure, safer yun kaysa basta sunbathing.