Here is some info on this from R’ Simcha Feuerman:

Lack of attraction, particularly when due to stresses of pregnancy and childbirth, can be extremely challenging. In many ways, this is a classic problem that some couples experience. Like many marital situations, this requires work on a few fronts at the same time.

Many women in this situation find themselves in a psychological catch 22. They don’t feel love and they don’t feel attractive and so they are depressed and eat more. However, if they work hard to lose weight, they also don’t feel loved because it feels that they’re only being loved for their body.

Similarly, the man is also in a catch 22. He wants to give his wife love and affection but because he partially feels resentful and partially feels truly deprived, it is difficult to give that love and affection. Of course, the less love and affection he gives, the less likely his wife to find the self-esteem and courage to work on losing the weight. A true catch 22 disaster.

The way around this marital disaster is to develop a routine and continuous system of speaking respectfully, honestly, and courageously to each other about the challenge. No emotional blackmail, no temper tantrums, no blaming, and no shaming. Just respect and honesty.

One might ask, what will happen next? The answer is, nobody knows. However, when you believe in each other and instead of isolating you keep staying close, solutions happen.

Couples therapy can be helpful. However, it’s like the doctor that sets the broken bone. The doctor is not going to heal the bone; only the body‘s natural mechanism can do that. The doctor, though, has to set the bones so the bone is in a situation where it can heal. Couples that cannot maintain honesty and respect and connection and instead isolate need therapy in order to be connected so that the healing happens.

It will always be a fight, but not always a struggle.