Stages Toothbrush for 4-24 months of Oral-B is extremely soft, ideal for your child's sensitive teeth and gums at this age. At this stage, infants begin to teeth. When the first teeth come out, usually between the fourth and the sixth month, it is time to start brushing. Features: 1. Unique, flexible head: Helps to protect sensitive gums 2. Soft nipples suitable for infants: Gently cleanses by making massage to teeth and baby's gums 3. Non-slip grip: Appropriately designed to be handled by parents thumb thumbprint for better control 4. Baby Einstein Heroes: Popular heroes that make the brushing toy for your baby Tip: Replace the toothbrush every 3 months or earlier if it shows worn out.