LO is 5 months, and his pediatrician had mentioned he could start using a sippy for fun/practice around that age. I called the office today to ask what I should be giving him in the sippy... water? formula? She told me to use juice! I thought that was a little odd... isn't juice pretty sugary for a 5 month old?! She said he wasn't old enough for water!

So... what did you use when you introduced a sippy? Also, was your LO around this age?