In all actuality, all kids are going to do bad things depending on their age, but generally speaking, here's what you can expect.
As a Leo mommy, you're going to be totally devoted to protecting your kid. It's a lion thing, you can't help it and you need to do it. You're also going to at some points, REALLY NEED TO BE AWAY FROM YOUR BABY. That goes without saying, and sometimes it'll be frustrating if you don't have someone that can take over.
This is where the goodness of the Gemini fiance comes in because well Gemini are back and forth, sometimes they want it, sometimes they don't, but they do make good nurturers when they want to. So when you're having your freak outs, he'll be able to play daddy and do a nice bang up job.
The real problems you'll have with a Taurus will come later in life, they're very determined, loving, and spiritual people. They are ruled by love in the world, if they love their job, if they love their lives, then they're fine. So all you have to do is give that Taurus baby a lot of love and attention, get over your Leo self, tell him to get over his Gemini self, make sure the child is always listened to and you'll be fine.