Five or six years ago, parents could wait until the third trimester to reserve a spot, said executive director Carol Brathwaite.

WSJ: It's Now a Grind For 2-Year-Olds

Women in their first trimester during the earthquake rated it as "extremely upsetting" whereas those who experienced it during the third trimester found it only "moderately" upsetting, she said.

BBC: Earthquakes 'trigger early births'