Can i put sunscreen on my 8 week old? if so, what is the best kind?

I don't use < 6m: Small infants need to stay out of direct sun except as needed for basic travel. Occlusive lotions or sunscreens plug pores & alter babies body heat control mechanism & can predispose them to overheat in the sun. Shaded outside activities or similar activities after sundown are better choices until they are older.

Yes: There are suncreens made for infants. I would look at whole foods for products that are safe for babies.