The Brooklyn Cyclones offered a Lamaze class in center field before Sunday night's game. It was one of the activities as part of the "Bellies and Baseball: A Salute to Pregnancy" event.
Other activities at the theme night for the affiliate of the New York Mets included expectant moms running - or walking - the bases without shoes before the game, women in their third trimesters throwing out ceremonial first pitches and pregnant women singing on the field during the seventh-inning stretch.
There was a craving station consisting of pickles, ice cream and pizza.
The team says any expectant mom who agrees to name her child Brooklyn or Cy gets free season tickets for life.