instead of going for any ayurvedic or other toothpaste, i would say use the plain white colgate toothpaste, but only after speaking to your baby's doc.
most toothpastes contain fluoride, and as your baby may still not be able to spit it out and swallow it instead, it is not really advisable. when you do use the paste, use only a very tiny pea sized amount.
also, i hope you are not feeding any sweet things to your little one. if yes, please stop it now.