I NEVER NEVER NEVER put my son down with a bottle.
According to the The American Academy of Pediatric Dentistry, putting a baby down with a bottle is the major cause of baby bottle tooth decay.
They say:
"Baby bottle tooth decay (or nursing bottle mouth) is a leading dental problem for children under 3 years of age. Baby bottle tooth decay occurs when a child's teeth are exposed to sugary liquids, such as formula, fruit juices, and other sweetened liquids for a continuous, extended period of time."
"The practice of putting a baby to bed with a bottle, which the baby can suck on for hours, is the major cause of this dental condition. The sugary liquid flows over the baby's upper front teeth and dissolves the enamel, causing decay that can lead to infection. The longer the practice continues, the greater the damage to the baby's teeth and mouth. Treatment is very expensive."
"Don't allow a child to fall asleep with a bottle containing milk, formula, fruit juices, or other sweet liquids. Never let a child walk with a bottle in her mouth."
Plus, If you start it now, it might be a tough habit to break when he is older.
It may be tempting to do C. - but it's just not worth it!
Good Luck to you!
D.