Paulsen: Every mom is her own harshest critic

It started out as an average Saturday. My kids were invited to a birthday party at a local fun zone with a bouncy castle, rope climbing and zipline. We arrived on time, but couldn’t seem to find the other kids.
I didn’t realize it at the time, but I had mixed up the dates and we were a day early.
As my kids and I frantically raced around, looking for the non-existent birthday party, my four-year-old chose that precise moment to ask me, “How, exactly, do babies get into a mommy&