Chorevia

Day 116 of 280 · 16 weeks + 4 days

The Tdap window

Last reviewed · 3 min read · 7 sources · Plain-text version

The whooping cough vaccine protects your baby in the first weeks after birth. Today you mark the window on the calendar and ask which week your provider prefers.

Size this week
about the size of an avocado
Length this week
around 11.6 cm from head to bottom
A South Asian couple at a kitchen table, the woman in a loose shirt with a small bump, circling dates on a paper wall calendar laid flat, a mug each, warm evening light.

Sixteen weeks and four days. Today is a date some weeks away: the vaccine that hands your baby protection against whooping cough before birth.

Your baby

One whole dark-green avocado on a plain white linen cloth, soft daylight.

Around 11.6cm from head to bottom, the size of an avocado (NHS), and about to have another growth spurt (NHS). Today's vaccine is for this baby as much as for you: the CDC's guidance for clinicians says that giving Tdap earlier in the recommended window maximises antibody transfer to the baby (CDC).

Your body

The NHS and the CDC time it differently, and it's worth seeing both. The NHS offers the whooping cough vaccine usually around week 20; it is available from week 16 to week 32 (NHS). The CDC recommends two vaccines in every pregnancy, the inactivated flu vaccine and Tdap, and says Tdap may be given at any time but is optimally given between 27 and 36 weeks of each pregnancy, regardless of how long it has been since your last dose (CDC); its clinician guidance gives the same window, "irrespective of the patient's prior history" (CDC). The AAP lists four for pregnancy: Tdap between weeks 27 and 36, flu, COVID-19, and, in one pregnancy only, RSV (AAP).

There is no single right week, only a window and a provider who knows which end they use. If you never had Tdap and don't get it in pregnancy, the CDC's advice is to get it immediately after giving birth (CDC).

Try today

  1. The Tdap window

    Time: 5 minutes

    1. Count forward from your due date and mark the start of week 27 and the end of week 36 on the calendar you both use (CDC).

    2. At the next visit, ask: "Which week do you prefer to give Tdap?" Write the answer inside the window.

    3. Ask whether a flu shot is due this season; the CDC says ideally by the end of October, and later still helps (CDC).

    4. If your due date falls between September and January, ask about the RSV vaccine too, which can be given from 32 to 36 weeks (AAP).

    Make it work:

    If you had a vaccine before you knew you were pregnant, tell your provider at the same visit; any further doses come after the pregnancy (CDC).

Watch for

  • Normal

    leg cramps, which may wake you at night (NHS); pressing your feet hard against a wall can help (MedlinePlus).

    Call your provider

    or seek care immediately for severe swelling, redness, or pain of your leg or arm (CDC).

  • Normal

    no vaccine yet this pregnancy; Tdap may be given at any time (CDC).

    Call your provider

    if you were given one of the vaccines to avoid in pregnancy, such as MMR, varicella, HPV or the nasal-spray flu vaccine, before you knew (CDC).

  • Normal

    a list of warning signs you have read many times and never needed.

    Call your provider

    if you feel like something just isn't right, even if it isn't on the list; tell every provider you see that you're pregnant (CDC).

For you

If you're the partner, or anyone else who'll hold this baby in the first weeks: the CDC's page is written for her, listing which vaccines she should get and which she should not (CDC). It doesn't answer for you, so ask your own doctor whether you are up to date on Tdap and flu, and do it before the baby comes.

Routine vaccines are safe for her right after giving birth, including while breastfeeding (CDC); a missed window isn't a closed door.

Sources

This guide is general education that summarizes published research and guidance from groups like the American Academy of Pediatrics, the CDC, and the WHO. It isn’t medical advice, and every child develops on their own timeline. Your pediatrician knows your child; if something feels wrong, call them. In an emergency, call 911.

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