Trouble with Prefill URL getting first and last name in

I have completed this here:
https://form.jotform.com/221294949078266
https://form.jotform.com/221294680508256
I have a couple questions:
1) I am having trouble passing child first name last name into the
respective fields
2) I am having trouble passing birthdate
I attached the code I tried. For now I have both first name and last name
of child passing into child first name field, and have dele

Hi Jennifer,

It looks like you're trying to pass this field with a prefill URL. For the child's name field, you'll want to make the URL look like this. You'll want to make sure whatIs36[first]={whatIs36:first} and whatIs36[last]={whatIs36:last}. You can find out more about prefill with URLs here.

https://form.jotform.com/221294680508256?parentguardiansName[first]={parentguardiansName:first}&parentguardiansName[last]={parentguardiansName:last}&parentguardiansEmail={parentguardiansEmail}&parentguardiansPhone={parentguardiansPhone}&whatIs36[first]={whatIs36:first}&whatIs36[last]={whatIs36:last}&whatGrade={whatGrade}&isThere={isThere}

Let us know if you have any other questions.