Quantity:   

Easily calculate the estimated date of delivery and the present age of your developing baby with this easy to use wheel. Just know the date of the last menstrual period, and align the arrows - and the wheel lets you follow the age of your developing baby. 

• 5" Diameter so you can easily read it, but still fits nicely into a labcoat pocket.

• Also shows expected weights and lengths of the fetus for each week.