New Baby

A women is sitting at home entertaining her parents who have come around to congratulate her on the birth of their first grandchild.
"So when can wee see the baby?", asks the grandmother.
"In a little while", replies the mother.
Some time passes. The grandparents are looking quite anxious at this point.
"So, when can we see the baby?", asks the grandfather.
"When the baby starts crying.", replies the mother.
The grandparents turn to look at each other, a little perplexed and ask, "Why do we have to wait until she starts crying?!"
The mother snaps back, "Because I put her down somewhere this morning and I can't remember where she is!"