Forget it & her!! Some people just have to be nasty.Rude whatever others say things because they're jealous & others because they must have an opinion on everything & they must tell anyone regardless & they are always right regardless. These people you have to learn to ignore (or at least ignore the hurt if it's someone you want/need in your or your baby's life).
Every woman is unique, some show off their pregnant bellies in an almost naked way others like you prefer to cover up (& isn't it winter there so what does she want you to wear, a bikini - which wouldn't be so bad here in australia as it's summer!!) & all the in betweens.
You will find that there is always someone (even strangers) ready to tell you what you should & should not do & what you did wrong, rarely do they think you got it right!!!! Now i'm telling you this & I was 29 when I got married 33 when I had my dtr & almost 40 when I had my son. I worked as a child welfare officer, later as a parole officer & I had travelled widely & worked overseas, so it's got nothing to do with being a teen - it's just that some people have to put you down no matter what.
My dtr is 15 (16 in may) & I still get comments about if I had breast fed & if I had stayed home to raise her then........... Would be different!!). You can not stop these people so just decide what feels right for you & your child & (while keeping an open mind for good advice & asking for help when you need it) stickto what you believe to be right.
Good luck