That’s not necessarily true.
There is ample evidence that women who have been through IVF are more likely to develop PND. The thinking behind it is seems to be that because there has been such a struggle to conceive, the person idealises parenthood to an unrealistic degree.
Personally I know two people who had IVF, after multiple miscarriages, years of treatments, and both of them realised that while they’d wanted a baby due to natural broodyness, neither of them enjoyed being a mum, and said that if they’d known then what they knew now, they would never have gone through it.
One of them actually ended up going back to work full time after just eight weeks, whenever they went on holiday they had to find somewhere with full-time holiday clubs by day and babysitting by night, because she felt that although she worked from 8-6 Monday to Friday and her DH did half the childcare on weekends, she needed a break from her dD. It was incredibly sad.
I think we need to be careful not to essentially paint women who have been through IVF as heroes and make some kind of statement that their children are more loved because of what they have been through, because that’s simply not true, and is an insult to parents who love their children just as much, and that means of conception is not a barometer to how much a child is loved.