Wouldn’t recommend taking your baby though as minibus drivers ain’t the safest. Your kid can not be done for overstay so why don’t you send your husband down one day and you look after the kid and then go the next day while he takes care of the child.
Definitely take advantage of the multiple entry tourist visa that you can get in your home nation before flying here. You can get stamped in with 60 days each entry and can extend for 30 days each time.
If you use it correctly you can get up to 9 months out of it.
You need to plan your last entry in to Thailand a day or more before the use by/ expire by date and you’ll get 60 + from that entry.
If you get a single entry while in the uk you will have to then apply for another single entry in a country outside Thailand while you’re traveling. No real hardship but why bother if you don’t have too..
A yearly extension goes under consideration for one month that’s why you got 30 days. Go back on the given date and they will stamp your one year extension.