At the 15-month well-child visit, babies typically receive up to six vaccines, making it one of the busier immunization appointments in the first two years. The standard shots include DTaP (diphtheria, tetanus, and whooping cough), Hib (a type of bacterial meningitis), pneumococcal, MMR (measles, mumps, and rubella), varicella (chickenpox), and hepatitis A. Your child’s exact lineup depends on which doses they’ve already received and whether any were given early at the 12-month visit.
Vaccines Given at 15 Months
Here’s what’s on the CDC’s recommended schedule for this age:
- DTaP (4th dose): Protects against diphtheria, tetanus, and whooping cough. This is the fourth shot in a five-dose series, with the earlier three given at 2, 4, and 6 months. The fourth dose must be at least six months after the third and is recommended between 15 and 18 months.
- Hib (3rd or 4th dose): Protects against a bacterium that can cause meningitis and pneumonia in young children. This is the booster dose, given between 12 and 15 months. Whether it’s the third or fourth shot depends on which brand was used for the earlier doses.
- PCV (4th dose): The pneumococcal vaccine protects against bacteria that cause ear infections, pneumonia, and meningitis. The fourth and final dose in the series is recommended between 12 and 15 months.
- MMR (1st dose): The first dose of measles, mumps, and rubella vaccine. This can be given anytime from 12 through 15 months, so some children receive it at their 12-month visit instead.
- Varicella (1st dose): The chickenpox vaccine, also first given in the 12- to 15-month window.
- Hepatitis A (1st dose): Protects against a liver infection spread through contaminated food or water. The first dose is given between 12 and 23 months, with a second dose six months later.
Your child may also be due for a flu shot if it’s flu season, and some children in this age range receive a dose of RSV protection if they haven’t already.
Why So Many at Once
Several vaccine series that started in early infancy wrap up their final booster dose right around 12 to 15 months. At the same time, the MMR and varicella vaccines become eligible for the first time at 12 months, because younger babies still carry some of their mother’s antibodies, which can interfere with the vaccine’s effectiveness. The result is a scheduling pileup where boosters and first doses land at the same visit.
Not all of these need to happen at exactly 15 months. Many pediatricians split them between the 12-month and 15-month visits. For example, your child might get MMR, varicella, and hepatitis A at 12 months, then DTaP, Hib, and the pneumococcal booster at 15 months. If your baby received some of these at the earlier visit, the 15-month appointment will be lighter.
MMR and Varicella: Separate or Combined
A combination vaccine called MMRV covers measles, mumps, rubella, and varicella in a single shot. This means one fewer injection, but there’s a tradeoff. Children who get MMRV for their first dose have a slightly higher risk of febrile seizures (seizures triggered by fever) compared to those who receive MMR and varicella as separate shots. The peak age for febrile seizures is 14 to 18 months, which overlaps directly with when these vaccines are given.
For this reason, the CDC recommends giving MMR and varicella as separate injections for the first dose unless a parent specifically prefers the combination. Febrile seizures are not dangerous and don’t cause lasting harm, but they can be frightening. Your pediatrician will likely discuss this choice with you.
Where the Shots Are Given
For children under two, all injections go into the thigh, specifically the outer middle portion of the upper leg. At this age, the shoulder muscle isn’t developed enough for safe, effective injection. After age three, vaccines typically move to the upper arm. When multiple shots are needed at the same visit, your child may receive injections in both thighs, with shots spaced at least an inch apart at each site.
Common Side Effects
Most side effects are mild and resolve within a day or two. The most common reaction across all these vaccines is soreness, redness, or swelling at the injection site. Your toddler may also be fussier than usual, have a low-grade fever, feel tired, or eat less than normal for a day or so.
The MMR and varicella vaccines can cause a mild rash or low fever that shows up one to two weeks after the shot, which is a sign the immune system is responding. Some children develop temporary swelling in the glands of their cheeks or neck after MMR. The DTaP shot is particularly known for causing soreness at the injection site and sometimes mild vomiting. The pneumococcal booster can cause fussiness and tenderness at the injection spot.
You can use infant acetaminophen or ibuprofen (for babies over 6 months) to manage fever or discomfort, following the dosing guidance from your pediatrician. A cool, damp cloth on the injection site can help with soreness and swelling.
What If Your Child Is Behind Schedule
If your baby missed earlier doses or appointments got delayed, your pediatrician will work through a catch-up schedule. The DTaP fourth dose, for instance, can technically be given as early as 12 months if the child is unlikely to return for the 15-month visit, though this is considered off-label. The Hib and pneumococcal boosters both have a window of 12 to 15 months. Missing the exact 15-month mark by a few weeks isn’t a problem, but falling significantly behind can leave gaps in protection during the period when children are most vulnerable to these infections.
Bring your child’s immunization record to every visit so your pediatrician can see exactly which doses have been completed and what’s still needed. If you’ve switched doctors or moved, this record is the fastest way to avoid unnecessary repeat doses or missed ones.