Hey mama! I think you might mean PCV13 vs PCV15 (not PCV2), those are both pneumococcal vaccines but PCV15 is the newer one na mas maraming strains ang kina-cover nito compared sa PCV13, kaya mas updated ang protection. Best to ask your pedia directly though, kasi they'll know exactly kung anong schedule ang best for your baby based sa current guidelines dito sa Pinas! A few of us moms just follow what our doctors recommend para sure lang na protected ang babies natin.