When should you start giving your baby sippy cups?

6 months with just a little bit of water.

My son was on them by 9 months

Thanks @guaderrama_babies2, @jaxmama

Ohhh really?

I started at 6 months

I think they have them as early as 4 months. I really started when mine was 6 months and eventually you can get training cups which are pretty awesome! So I guess pretty much whenever they're ready!