How do I obtain an ip pin for my child online. I'm going under my account, but it keeps giving me a pin. I've mailed them a form in a requesting one, nothing.

you can't get it through your a/c. you would need to establish an a/c for the child.

 

see this IRS website

https://www.irs.gov/identity-theft-fraud-scams/get-an-identity-protection-pin#alternatives 

 

 

if you can do it online 

you can fax the IRS form 15227

you use the child's name and SSN

but you provide your name as the person to call

https://www.irs.gov/pub/irs-pdf/f15227.pdf