I am a husband and father of four children. Yes, childbirth affects women's emotions and a couple's intimate life.
It can take weeks or months to physically heal up, so of course childbirth will effect a couple's intimate activities. If a mother nurses, that can be physically demanding, especially at first as she is learning the ropes. Waking up to make those bottles is also demanding.
Is there a product out there you put in formula and water and push a button to fill a bottle with a certain temperature of water? If not-- why hasn't some company done this yet. It would help with the sleep issues.
Some babies are big poopers and will fill up diapers at night. So parents have to keep getting up for feeding and diapers and stay up for burping. If the mother is nursing, she will have the heavier burden when it comes to these things. If she's on maternity leave, she may take more over.
So after a woman heals up, she's sleepy a lot of the time for months. Then there are hormones. Post-partum hormonal issues can cause problems, too. This can last for up to several months. Some women get full-blown post-partum depression. What is more common is post-partum blues.
Have you ever gotten into an argument with a woman with PMS? Multiply that times 15. I wanted to take our first baby downstairs to spend time with my parents when we were staying with them. My wife was afraid the stuff my mom used to clean the floor would hurt the baby. (New mothers can have this overly protective instinct that kicks in with the hormones. I think it's a lot more likely to happen on the first baby.) I'd talk to her about it, and she acted like I had hurt her by talking about this with her-- as if I'd done something cruel to her like put her pet puppy in the blender. (She didn't have a puppy. I'm just saying.) Post partum can turn into these crying, weepy arguments where she says a whole bunch of stuff about her feelings that doesn't make much sense to the husband. The husband has to be very understanding during this time.
The first-post partum was really bad. The second wasn't quite as bad, but I kind of backed off from my wife if she seemed moody too much because of the arguments the first time. If I had that to redo, I probably would do that differently. My wife had a little post-partum moodiness from time to time with this last baby, but not as severe as the first from my perspective. We didn't argue as much.
I think one reason we didn't argue as much is because we've grown in our relationship with each other, and we've also grown in our understanding of our roles in marriage. I know I need to love my wife in a self-sacrificing way. I knew what to expect with post-partum. I have to be careful to talk in a loving tone of voice if she is stressed and help relieve whatever burdens she has. She realizes better than in the past that she needs to be respectful and submissive toward me. That effects how she may speak to me. It really helps prevent arguments if each of you are careful not to yell or talk to each other disrespectfully. The respect and submission issues prevent the wife from steamrolling over her husband, pushing, or nagging to get her way. Post-partum may tempt a woman to do that. Having what your roles are engrained and in mind before it hits can help lessen it's effects, IMO.
Post-partum goes away after several months. In most cases, my wife was normal when I talked with her after childbirth. Post-partum emotional issues showed up occasionally, especially when she was tired, which happens a lot if the baby is young. Men get sleepy two if they care for the child at night, too. Sleepy men are certainly capable of grumpiness.
It helps us to pray and spend time in the word. My wife relies heavily on her fellowship with God in prayer to keep her moods straightened out anyway, apart from post-partum issues.