Baby food costs less than puppy food. Babies love to be rocked and cuddled. Puppies expect no less. Babies outgrow your lap in five years. Puppies outgrow it in five months.
Babies go for a walk in a stroller.
Puppies, when they will walk, go out on a leash. Babies sit in carseats, well strapped in and immobile. If you are smart, puppies sit in car-cages. Mine rides in my lap. Babies go in play-pens.