The 24-year-old 'Lizzie Mcguire' star became mother to Luca in March and expects Comrie, 31, to stay at home because she prefers to resume her acting career, reported Contactmusic.
"She had Mike trained to do diapers and bottle feedings, and she has put him in charge of other household duties, including making breakfast, doing laundry and light cleaning," a source said.
"Mike loves his son and is enjoying the bonding time, but he jokes he feels more like Hilary's slave than her husband," the source added.
Duff has no movies scheduled at present, but she recently finished a film project "She Wants Me".