The couple announced their first child together Tuesday and said they expect to deliver the child in the summer.
In an appearance on "Extra," Baldwin said he's having sympathy symptoms for his newly pregnant wife.
"My boobs hurt," he joked. "My boobs are killing me, so sore. My jeans don't fit. My pants, I can't buckle them."
He said Hilaria has been craving pineapple.
"She was eating troughs of pineapple. I mean like tanker containers of pineapple," he said.
"I didn't eat pineapple before. It was bizarre. I really wanted pineapple," Hilaria added.
Alec told "Extra" he's looking forward to staying home with the new child while Hilaria, an "Extra" lifestyle correspondent, goes off to work.
"My dream is to be home with the baby. Standing in the doorway, saying goodbye to mommy. Mommy is going to work now. Bye mommy, see ya when you come back!" he said.