Almost 5 months old.?

Sound liek you should start giving him a sippy cup! Hes curious so Ide let him have a go at it! the thing that will affect his teeth is if you let the juice/milk sit on them. Like giving a baby a bottle in the crib to go tto sleep with.

I always use 1/2 water 1/2 100% juice. I use my own juicer so I knwo there is nothing but the good stuff in it! :) When you give him the sippy cup to try just make sure he is sitting upright. The flow may cause him to choke if he is too eager. Give him cheerios or the puffs that melt or rice rusks (babies r us) see how he likes those and he may even suprise you and learn to self feed! :) Boys tend to eat tabel food faster then girls both my boys between 6-9 months were on my diner table food (just cur up small and obviously not givign them steak and hard foods lol) my princess is 8 months and barely eating purees! So each baby does these things in their own time and you just play by their cues! :)

Grabbing your cup and taking a sip from it is how babies learn to drink from a cup. If you drink water, there is no harm in letting him try to take a sip. You can wait a bit for the sippy cups.

You can try a sipper cup that is age appropriate. You can also give him baby food, applesauce, mash potatoes, anything smooth. He sounds really curious in food. Feed him some different food and try a sipper cup. It never to early to learn.

I say now if you put formula or breast milk in it . He's fine you can get dippy attachments for bottles like Avent you can try with