I have to say that motherhood is the hardest thing I have ever done, even through the 12 years of post secondary education, the postdoc cancer research, the biotech jobs. Going through pregnancies, deliveries, nursing every 2-3 hours, sleepless nights, crying babies, sleep issues, late night illnesses, having to nurse while trying to tend to toddler at the same time while getting the basics of groceries, laundry, meals, cleaning, some self time is HARD.
This is quite the big social experiment in our civilization. I don't think that humans ever had these small nuclear families. Historically, we had larger tribes and villages to help with all the basic necessities with children and family needs. Now, it is up to one Mom or one Dad. How crazy is that?
For the primary care giver, here is no PhD of parenthood awarded after, no monetary rewards, no feedback of any kind (well, in the early years), nothing. For those who used to be out in the workforce and took the option to stay at home for the babies, you question your "net worth." I have had many conversations with Moms about this topic. But you know, it is normal to feel like this. It is fine to feel uncertain. But I think we all need to remember that whatever parenting strategy you take, you are doing the best you can, under the circumstances and what you believe in. You are trying your best to help mold some character and morals into your child. And that, makes it all worth it.