I should know. My baby just turned 4. Babies growing up is one of the most bittersweet of the human experiences. I’d personally call it the most bittersweet, though I know the experience is different for everyone. One minute you’re staring into a tiny, squishy, perfect face you’ve waited 40 weeks to see, then before you know it you’ve change 3.89 million diapers and your tiny little squish is having complete conversations, pondering the world around her, and demanding her favorite breakfast at 4:30 am. I spent my childhood dreaming of being a mom. Once my husband and I were married, I was even more excited at the thought of…