The account given here is confusing. It states that John North's wife is often given as Hannah Bird, then presents evidence that it was actually Hannah's sister Mary Bird, then concludes that the "various old family records" that say she was Hannah Bird might be reliable.
↑ Since there is no evidence supporting the notion that this John North is the one who came in 1635 and went to Ipswich, there is no reason to expect that this John's children were born there.