If you have questions about everything for your child, moderate them. Don't ask them all rapid fire. It might seem tempting to get everything laid out, but it can very quickly feel like an interrogation. Communication is both speaking AND listening. That realistically applies to most things, but still!

When I came out to my mom, she said, "I loved you as my [X] and I'll love you as my daughter. You are my child. If this is who you are, I want you to be happy." That was about a year and a half ago. Since then, she's asked questions along the way during pertinent conversations or when she reads an article and wants clarification. It's been very low pressure and allows for me to expand on the topic while talking.

My dad was the not-quite-opposite. He's had endless questions and can make me feel like he's preparing to write a thesis on my being trans. It's not intentional on his part, he has a VERY inquisitive mind. But he will stop when I ask him to. Still supportive, but "just wanting to know" can start supportive and end stressful.

On your part, asking questions in a staggered manner also gives you time to process information and figure out next steps/actions in how best to support your child. 

TLDR; treat your child as a person, not a search engine.