Flying 30w5d

So I’m flying from Cali to Texas this Sunday. I’ll be 30w5d. We’re moving there so I will have a lot of luggage. Plus I’m flying with my toddler while my husband drives my car there with our three pets. It’s about 4-5hr flight. I made sure to do an hr and a half layover to give myself time to stretch, pee, and eat. And give my son some time to stretch and run out some energy before the next flight. I intend on wearing compressions socks. But any other tips? I’m scared because sitting is so so uncomfortable for even the shortest of times. The only comfortable position is reclined sitting. And I know I need to stay hydrated but I’m scared to drink to much and have to pee on my flight and have to drag a toddler to the tiny airplane bathroom with me to pee. And I I’d walk the isle periodically but again I can’t because I have my son I can’t leave him alone plus I read on the website that children they want them to have window seat which means I won’t be in the isle so I can easily get up and walk. Anyone recently flown that far along in a similar situation have any tips for me. I’m slightly stressed 😩