Our middle child was 72 minutes old

[GoodTaste]

Our middle child was 72 minutes old when the midwife listened for his heartbeat and heard no sound. His peaceful death was the long-anticipated conclusion of a pregnancy fraught with inconclusive scans and tests, and eventually a diagnosis of anhydramnios that put all ambiguity to an end. With no more amniotic fluid to help his lungs grow strong enough to breathe, we knew that his birth would be the death of him.
Source: The Lancet

By "middle child", I think the speaker means that he has 3 children - one younger, the middle child, and one older. Am I on the right track?

 

[5jj]

By "middle child", I think the speaker means that she has 3 children - one younger, the middle child, and one older. Am I on the right track?

Yes. The child was the second of three born to the speaker and her husband.

 

[Tdol]

The sad death of the child does not change the fact that this child was the second of three.