[I once killed a party with this joke. You have been warned!]
Three expectant mothers are sitting in the doctor's office, knitting.
The first mother puts down her knitting, picks up her handbag, pulls out a bottle of pills, takes one, then resumes knitting. She sees the other two mothers looking at her, so she says, "Vitamins. Good for mummy-" She pats her stomach. "-and good for little baby."
The second mother puts down her knitting, picks up her handbag, pulls out a bottle of pills, takes one, then resumes knitting. She sees the other two mothers looking at her, so she says, "Essential minerals. Good for mummy-" She pats her stomach. "-and good for little baby."
The third mother puts down her knitting, picks up her handbag, pulls out a bottle of pills, takes one, then resumes knitting. She sees the other two mothers looking at her, so she says, "Thalidomide." She shrugs. "I can't knit sleeves."