Putting it bluntly, he may not yet be 2 yrs old, but my first-born seems HUGE now.  My brain keeps tripping out while I’m changing his nappy or combing his hair.  “You shouldn’t be changing his nappy,” my brain screams at me, “he’s big enough to flip a car; why, he could punch your lights out!  You should definitely hang out with the new baby more, perhaps he’ll grow just as big and strong and protect you from the firstborn?”