By Nicole Sperling
Updated May 10, 2010 at 12:00 PM EDT

Mother’s Day may have been great for moms but it was not very kind to Iron Man 2. The PG-13 rated sequel actually fell more than 30 percent from Saturday, putting its three-day gross at $128 million. It still holds onto the title of fifth-highest grossing debut of all time, but it’s not nearly as close to Pirates of the Caribbean 3’s number of $135 million as originally predicted. Mother’s Day was good for one movie: Babies. The documentary from filmmaker Thomas Balmes grossed $1 million on the celebratory day, 50 percent of its entire 3-day $2 million gross. Seems those moms just can’t get enough of babies, even when they’ve got some of their own at home.