Infants and restaurants

"The Travel Crib Gordian" (BG) can be put into a sims inventory. Place it anywhere then put the infant in it. You can add highchairs to a restaurant. An infant can sit in a highchair once the Lift Head milestone is achieved. Without Growing Together installed, there are no milestones so you wouldn't have to worry about that. If the infant is sent to daycare then arrive at the lot with the family and then click on the portrait to bring them there.

I've never tried it myself but in theory this should work.