You should call Poison Control at (800) 222-1222.

Before calling Poison Control, try to determine what your child has taken and, if possible, the amount. 

Keep all medicines and poisons, such as household cleaning products, out of the reach of children, preferably in a locked cabinet. 

Most houseplants are not dangerous. However, some plants are unsafe such as Philodendron, Gardenia, Daisy, Iris, Holly and Buttercup.