Quoting melindapple:" I exclusively breast fed the first 7 months (no bottles, tried once and she didn't take to it). How long ... [snip!] ... is okay? I don't really think there is anything I can do to help her except continue to let her practice with it anyway right?"Mine's 7 months and bottle fed. Can't feed herself with the bottle, nor figure out how to tip the sippy yet. I have yet to try a straw cup though.