(he's 6months going on 7)
I quote the following:
When should I introduce a sippy cup?
Some babies enjoy a sippy as early as 5 or 6 months, and others aren't interested until after their first birthdays. Most babies seem ready around 7 to 9 months, though.
From the BabyCenter.com web page at: http://funadvice.com/r/14u3k74ll40
I would say that implies it is worth trying him with one right now, but don't be anxious if he doesn't take to it straight away.
Best wishes - Majikthise.
Does it mean you start giving your baby formula milk? If yes, then you should introduce the milk to your baby using spoon until he is familiar with the taste. After one or two days, you can use the bottle. It is not difficult though... All it takes is patience :-)
my cousin uses them and she is 14 months old