There are a whole range of responses that men have to women being pregnant and giving birth. Difficult though it is for me to understand, I’m aware that a significant number of men find pregnant women to be unusually attractive, even to the point of becoming fantasy objects. Likewise, some men see mothers as more attractive than non-mothers, possibly because of personality traits that seem to come to the forefront in a woman after she has a child.
At the other end of the spectrum are men like your husband, who feel that pregnancy and motherhood somehow diminish a woman’s femininity and sexuality. It’s easy to suggest that his view is wrong or short-sighted, but that doesn’t help anyone in this situation. To me, this sounds like a great time to engage a professional marriage counselor.
While it’s possible that this might cause your husband to see you in a different light, it may also bring to the forefront emotional issues that your husband is dealing with, but unable to talk freely with you about. In my case, seeing the birth of my oldest son caused me to feel a huge sense of responsibility that i was completely unprepared for. This may not be the case with your husband, but such things are always a possibility.
Regardless, if you can sit down with a third party who has professional credentials, he or she may be able to help both of you discover things that have become factors in your change in relationship. If cost is an issue (and when I was a new father, it most definitely was), look into counseling options subsidized (in part or in whole) through a local church or synagogue.
One last thing: Your husband’s response to you may feel like something that defines you as a woman, but it doesn’t. You remain a person of worth and value, regardless of anyone else’s actions. Your husband’s response being strong does not make you “more of a woman,” and his lack of response does not make you less of one. The role of mother need not diminish the role of wife, any more than becoming a father keeps me from being a husband. Yes, your body changes with childbirth, but I would suggest that your husband has changed (and will continue to change) just as much between his ears.
Becoming parents changes us. We can fight this, and refuse to accept it, or we can be the master of our path and define the role instead of allowing it to define us. My best wishes for you, your husband, and your children. – Tim