How do you know which formula and bottles to pick?

Emily • Mommy to K 💚 6/11/19

I’m lactose intolerant so I’m thinking baby most likely will be too... I’m only 13weeks6days now but I’m starting to think. Is it more just trial and error when baby comes?

And with the bottles should I just get a few different ones and try those as well and find out which ones he sticks with and then buy more depending?

I’m a first time mom!