Full Post: br Visit Kute Keiki here: br br For more Information on Teething Visit: br br br Babies could start teething at different age durations based upon the baby as well as their genes. When teeth erupt, it can be a lot more uncomfortable for a 3 month old toddler, 2 month old baby, or 4 month old infant considering that they could be a lot more delicate, yet this will certainly pass as long as they are still healthy. br br Starting to show teething signs and symptoms at 3 months of age is normal for many young babies, and nothing too big to be worried about. Their teething timeline is still the same as any other little infant.