What is an altrasound?

An ultrasound is this thing where they put stuff on your stommach

and the reflections of high-frequency sound waves construct an image

of a body organ, observe fetal growth, or study bodily organs.

Fetal frowth is a baby.

so you can go and get an ultrasound that will show you the baby your carrying.

unless you really meant altrasound,

but that's not a Word.

ahah, I hope i helped you out. =]