(Strip Number 4234, Original Publication Date, 29 September 1982)
Panel 1: We find ourselves at the local hospital; as she walks down the aisle, Elly tells Mike and Lizzie that they're going to be very quiet because of where they are.
Panel 2: Having arrived at the maternity ward to see Baby Boy Nichols, Elly tells the kids that Steve is going to bring him to the window so that they can do so.
Panel 3: She next exhorts them to do something that they're already doing: looking at the baby.
Panel 4: Having noticed how tiny he is, Mike asks why babies come so small. This baffles Elly because she expects that Mike knows something that he cannot: that he too came out of an opening larger than he was.
Summary: As I said, this is an almost age-appropriate thing for a seven-year old to think. By now, he should have realized that for reasons his parents won't tell him, being very small is a desirable thing for a new-born to be.