I posted something way back upthread, that I found in one of those '5 facts you need to know about Chris Watts' articles.
It was a screenshot of a text that SW sent her husband from the OB office, with a pic of the new baby sonogram---
And CW replied by saying [paraphrasing from memory]:
" I love that lil peanut already'
So that makes me think he was, at one time anyway, excited and happy about the new baby.
Also, SW had posted publicly that they were trying for another baby. Would she have said that if he was against it?