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DTaP vaccine (diphtheria, tetanus, acellular pertussis)
When: At 2, 4, 6 and 12 months old
Why your baby needs this: This combined vaccine wards off diphtheria (a bacterial respiratory disease now rare in the U.S.), tetanus (aka lockjaw, a nervous system infection) and pertussis (whooping cough). It’s vital because pertussis, a highly contagious bacterial infection that’s very dangerous for infants, has reemerged in pockets of the U.S.

NEXT: Hib vaccine (Haemophilus infl uenzae type b conjugate)