At what age do we have to brush the baby's teeth?

You can start brushing your baby's gums even before the first tooth sprouts. I don't use dental wipes because I find that there's no need to. I purchased a finger brush (easily available from Kiddy Palace or Tom & Stefanie) which I use during her bath time twice a day to clean her mouth and get her used to the idea of brushing her teeth. Using it like a toothbrush, I brush gently on her gums and tongue. It works very well to remove milk residue. The bristles are soft enough not to cause injury to her gums. Before your baby's first tooth sprouts, you can use gauze or a washcloth and distilled water to wipe around your baby's gums as well. http://sg.theasianparent.com/how-to-look-after-your-babys-first-teeth/