Is your baby cranky, and constantly drooling? These are usually signs of teething. You're going to need a few teething remedies. When Do Babies Start Teething? Although timing varies widely, babies often start teething around 6 months. The two bottom front teeth (lower central incisors) are usually the first to appear, followed by the two top front teeth (upper central incisors). Classic Signs of Teething Drooling; (Drooling can irritate your baby's skin and cause rashes. See What is a teething rash and how do I deal with it?) Chewing on anything they can get their hands on; Irritability or crankiness;