We are made to love kids or our species wouldn't survive. Although becoming a mother for me, the lack of sleep made me tired and grumpy my first couple years of motherhood. I often thought if I didn't love my kids so much I would toss the screaming little demon out the window during those first 2am feedings.
I am glad my kids are grown up now and I can pick the times I want to care for kids instead of being on the job 24/7!