Kids who need two flu doses this week are running out of calendar.

If your child is between 6 months and 8 years and has not already had two lifetime flu shots, this week is the last comfortable week to start. The second dose has to wait at least 28 days. Pediatric groups still want both doses in before the end of October. Some Vaccines for Children clinics are getting late, small shipments. That is the calendar problem, not a new virus.

Background

Influenza protection in young children is not one-and-done the first time. The immune system needs two introductions, four weeks apart, if the child has not already collected two doses in prior seasons. After that, one dose a year is the usual plan. All US-licensed flu vaccines this season are trivalent. Afluria is gone. The dose count itself did not change.

The American Academy of Pediatrics still recommends flu vaccine for every child 6 months and older without a medical reason to skip it. Last season, coverage sat near half of US children. That is the starting point, not a target.

What changed this week

Two supply stories landed at once. Some VFC clinics told AAP they received flu inventory about two weeks late and only in small boxes, which breaks walk-in clinics and makes a second appointment harder for families who already struggle with time off and transport. On 29 September, CSL Seqirus said its 2026–27 manufacturing run finished and extra doses are sitting ready, after three strain changes slowed other makers.

The calendar does not care which story is true in your county. Dose two is 28 days after dose one. To finish by 31 October, dose one wants to happen by the last days of September. Today is 30 September.

Competing viewpoints

One clinic will tell you to wait for the brand they prefer, or for a Saturday event that may never be stocked. Another will say take any age-appropriate licensed shot today, then book dose two on the way out. Families on VFC cannot shop pharmacies the way insured families can. Pediatricians in high-VFC practices have said out loud that they worry those families will not make it back.

Neither view is a morality play. It is inventory plus a four-week clock.

What to watch next

• Whether your pediatric office or health department can give dose one this week, even if the box is small.
• State VFC allotments through mid-October.
• The RSV antibody window that opens 1 October in most of the continental US — same visit is allowed when the products are in the fridge.

This is editorial context for parents, not medical advice. Ask the child’s clinician what that child should receive and when.

Sources: AAP 2026–27 influenza policy; AAP News / Drug Topics reporting on VFC COVID and flu ordering, 24–29 September 2026; CSL Seqirus 29 September 2026 supply note.