travel with a 11 month old baby crocodile that won't sit still

Michi

I have a 2 hour bus + 2 hour flight + 3 hour layover + 15 hour flight coming up, just me and baby... tips? please help me. why did I even agree to this lol. has anyone been through security with a stroller? does it go on the belt or can you push it through? I wanna check it at the gate.