Husband is unsure

How can I convince my husband that I want another child.

A little back story.

We lost our first child to pre eclampsia at 26wks and have a rainbow who spent 56days in NICU.

Yes it was traumatic but I am ready to try for 1 more.

I have always wanted 2 babies and yes technically I have buttt I would love 1 more I get hubby is worried that he may lose both of us.

I will be on a specialist team and constantly monitored and yes bub will probably need NICU again and I am okay with that.

I am not getting any younger and want 1 more and than I am done.

How do I convince him everything will be fine!!??