There are some COMPULSORY jabs by SG govt which is 3-in-1. it is FREE at polyclinics.
However, most parents would wanna pay more for 5-in-1 or 6-in-1.
if you choose to pay more, it is jab at 6wks. it is common practice for quite some yrs (my son who is 2+ this yr was jabbed at 6weeks 2 yrs ago).
going to GP is definitely more exp. polyclinics now offer the same 5-in-1 and 6-in-1 as GPs and PDs