HI

yes some babies can start as early as 11/12 wks i've read, you'll know instinctivly as they will be drooling a lot more biting everything maybe loss of appetite and may get small clear bubbles on the gums. My neice started at 12wks so i think it differs from baby to baby,

Rhys weighs 13lbs and is 12wks on tuesday he takes 6oz bottles during day and a 7oz before bed, i would honestly try a bottle before bed but 6oz to see if that makes your baby more contented, i first gave my son a bottle at 3wks when i went into hospital with mastitis and he stayed at home with his daddy so got a bottle instead, then i started breast during day and bottle at night and then totally bottle when i had to go on painkillers for back, and he's healthy happy and fine, the only thing that changed obviously was his poo it's thicker and smellier on bottle, lots of people can scare the life out of you by saying only breast!!!! but a bottle at night if you prefer to breast feed won't do him any harm and i found that it made the transition easier too when the time came to put him on bottle full time.