In Batman Begins, a scene where Batman goes to talk to then Sergeant Gordon briefly shows Gordon's wife feeding a baby in a high chair.

Jim Gordon's kids in the Chris Nolan Batman films.

Even though A Quiet Place Part II starts exactly where the first movie ends, the 3-4 year gap between each film meant that the Abbot's two children have visibly aged over the course of a scene.

A four-year-old, on the other hand, can be expected to remember simple lines and stage direction. They're old enough to assert themselves, but too young to understand the concept of acting, meaning they'll basically just do whatever comes naturally to them. There's also the fact that toddlers are notoriously difficult to work with as actors.

Thus, sitcom kids generally turn four or five within two years of their birth. Babies are cute and give adult characters opportunities to show their nurturing and/or silly sides, but toddlers are of little use in comedy until they're old enough to be smart-mouths on their own. On sitcoms, the change isn't quite as drastic but it's still present.

But with a new character in the ensemble, after a few years the usual practice is to age them way up so they can have more mature events occur in their lives. In daytime soaps, where pregnancies and Switched at Birth drama are staples, the resulting baby really isn't needed once the plot has been resolved, so they're rarely seen in their toddler or childhood years.

Definition soap opera