Panda
I dunno abt the ikea dining chairs. But the ikea high chair is very stable, bb shd not be able to topple it. My girl used to push it along as her walker!
I taught both my girls how to go up n down stairs. Actually u'll be surprised, bbs r very aware if wats going on. My girl can see the step n will stop there n scream for help. If I dun help her she'll figure out a way. Her way now is to sit on the floor, let her legs hang over the edge till her feet touch the ground then she'll stand up n she's on the other side already.
U need to differentiate bb cry. Whether is screaming cos tantrum, cannot get wat they want or truly distressed cry, in pain, hungry, scared etc. the former I will ignore, the latter I will attend immediately. Actually if u always give in they will scream more cos they know tats how they can get their way.
My elder only threw one major tantrum, screaming kicking rolling on the floor. We removed everything from around her n walked off ignoring her. She screamed/cried for 30mins n never did it again. My younger is more stubborn. Screamed, cried, kicked legs, roll on the floor for 45mins until she gave up.
U gotta establish ground rules especially at home. Otherwise next time if they're out n all walking already, u may not be able to control them. U hv 3 lei, when they reach terrible twos n start talking back, u'll hv big problems.