this is a really good place to say to all the parents here:
go NOW to your yellow pages and look up the number for your local poison control center. write it down in big block letters and TAPE it ON your phone.
and always call poison control right away when you suspect your child MAY have swallowed something that MAY be harmful. there is no harm in calling, they are really nice folks there and most of the time, you'll get your mind set at ease quickly by someone who has so much information at his or her fingertips. the mamas here know so much, but please don't take any chances, call poison control immediately.
public service announcement over.
bunny's mama
(who called poison control just this morning when bunny took an opened blister-pac of visiting grandma's cancer medicine out of the trash can and told me she took the pills herself) 
Follow Mothering