You could respond with something like this:
"Hey love, I really appreciate your understanding and patience when it comes to waiting for our visits. It means a lot to me that you're willing to put in that extra time and effort. The idea of waiting until she's older is definitely a big factor, but knowing that we can still connect and make plans to visit each other helps ease any worries I have.
Distance can be tough, but it’s comforting to know that we’re in this together, and that we have a future to look forward to. I really value our relationship and the bond we’re building, and I’m more than willing to wait as long as we continue to support each other along the way.
I can’t wait for the day when we can finally be together in person, and I’m excited about all the moments we’ll create when that happens. Thank you for being so understanding and for always being there for me. I’m really looking forward to our next call and sharing more of our days together, even from afar."
Feel free to tweak any parts to better suit your voice!