formula?

mamma love. • Mom;5-13-13 💜👩6-12-17💜🧑3-17-10👨 angel baby 2-10-19👼

has anyone left baby on formula past a year? did doctor suggest it? also seasonings behind it? my daughter is 13 months and has had the poos for 3 weeks now!! they switched her from soy milk to lactose free?