Congratulations — and sorry

Three or more babies at once is genuinely rare, and that is exactly the problem: there aren’t enough births in the national record for us to say anything about your dates that we’d stand behind.

Rather than show you a number we don’t trust, we’d rather show you nothing. Higher-order pregnancies are also monitored much more closely than ours, so your care team’s estimate will beat any average we could offer.

Expecting twins? We do have data for that.