just buy a couple different brands maybe only a few 4 oz bottles I felt like in a matter of weeks my soon went from 2 to 5 oz then one night we had to run to Walmart and buy all new bottles because we only had 4 oz ones
Dr Browns were good but such a hassle to clean. My son likes Avent and MAM brand. He only likes one pacifier and it's the MAM brand so we can't leave the house without it.
Now I only have him on the Walmart brand parent choice bottles because on the slow nipple and the size of it, it doesn't run everywhere and he drinks so fast that he'll choke at times so the slow nipple actually makes him work for it
I used Avent bottles and they worked great for my son
I used tommie tippee 5 oz with my first and when he started drinking more than 5 oz I used the cheap one from Walmart (parents choice, I think). They have 5 oz and 9 oz
I boughtglassbottles for my daughter when she was born, and shat actually ruins their teeth is if they use a pacifier all the times...at least thats what my mom said, oh and the glass bottles also helps them not get gasses