The rear-facing camera let's him know I'm here.
A joke about child-rearing technology becoming over-complicated --- here, the mom has all the latest technology for her baby, including a monster-truck-esque baby carriage. The carriage itself  is quite complicated, and the baby can't even directly see the mom: the baby can only see the mom via a rear-facing camera. It's funny in part because it comments on how technology might be separating us more than connecting us.