U can do it urself...no kit is required... 
i also casted my baby's hand nd feet impression at home by using clay and wall putty...

you get a lot of these kits on Amazon.. they work well

Yep.. i did professionally not with a kit.. but i hv heart first impression kits are very good

9987332279 -Honey 
u can heck her page on fb The honey effect 
This suggestion got from @616d5cabb34e550013ebda95

Niyati Parekh Karandikar

Has anyone used 3D casting kit for their little ones? To get a casting of their hands and feet..please suggest a good one..I want to do it for my daughter..(reference pic given)