Awkward to say the least

It doesn't contain the antibodies that babies need to gain early immunity though. Until they're old enough to vaccinate, babies can only gain immunity through their mother's breast milk, which has the antibodies that the mother's body has already produced.
Edit: ANTIBODIES, not ANTIGENS.

Antibodies, you mean. Babies get maternal antibodies from their mother's milk.

FUCK
You're right, my bad. And I call myself an Animal Science major...

But many women cannot breastfeed their babies for tons of reasons (baby was born too early, tities are too small, the mother is too weak or get sick, etc...). So.. again, mind your own business and let parents feed their kids the way they want. :)

Same. Why would they comment on what you're buying in that way

Because people are dicks and think they know it all.

It's better for the baby to breastfeed generally, for a number of reasons, one of the biggest being the secondhand immunity to disease that breastmilk provides to the baby. There are a number of reasons one might choose to not breastfeed, but it's usually better for he baby to do so, especially during the first few months.
Note: no judgement if you don't breastfeed, just trying to help explain the issue.