For us, the first couple of months after the birth of each baby was difficult (or at least less frequent) for us sexually. We DID have sex, but my drive was muted by constant baby needs, being touched ALL the time by a tiny person who needed
my body to survive and lack of sleep.
After the "Hundred Days Crying" (what people in China call Colic. It lasts about 100 days and there is... crying. All my kids had colic, but the oldest had it the worst.) things got somewhat better.
Things got a LOT better around the one year mark. I usually get my period back when my babies are between 12 and 14 months, due to continued breastfeeding (I breastfeed a lot longer than that, but that's when my estrogen kicks back in again, and most women who Ecologically Breastfeed see about a year of no periods after the birth) and my drive continues to increase.
By the time they are sleeping through the night (between one and two years with my kids) things are on an even keel, except for when babies are sick or need Mama in the night or whatever.
It did make a huge difference in our sex life, BUT, getting to know each other as the children got older and more independent lead to a lot of good things.
I take everything as FLOW. One things follows an other and the less than heavy sex drive I have when I have just had a baby is actually an evolutionary advantage so that THAT baby gets my undivided attention by my not having an other child too soon. We did have sex, often within days of the babies being born, but I enjoy it a lot more when I don't have the constant needs of a baby on my mind. Of course when I do have a baby to take care of, I don't really think about sex all that much. My kids NEED me and I know they will grow and things will change between My Man and I. Then, as they don't need me all the time, there is the cycling back to HIS needs being met, as well as mine.
It all evens out. I wouldn't have traded Attachment Parenting our babies for anything in the world.