I've been told that "as long as you possibly can" is always best...but I think it's creepy once a kid hits like...1 year old. I've always been kinda weirded out by breast feeding. My mom said I refused to as a baby, and same with my brothers. Nina took to it, and as much as I hated breast feeding, I intended to for 6 months, but I had to stop at 3 because of supply problems and switched to formula. Nina didn't mind.