My youngest son didn’t look like a linebacker when he was born — just a squishy little 8-pounder — but apparently lurking inside his tiny body was the capacity to grow into a huge, hulking toddler. Before I knew it, people were asking if he and his brother, who’s three years older, were twins. The nurse at his pediatrician’s office took his measurements and said, “Wow! He’s a giant!” And I was buying diapers in size “your kid is too old for diapers” and fully anticipating harsh judgment from the cashier.