My two sons are 11 months apart and in pregnant with my third which when baby is born it'll be another 11 months apart from my youngest. Will have three children oldest being 2years old. You do learn to manage having the two! I've always found that my children fit around me but are in a routine. My eldest ATM being 15months old goes to bed between 7pm and 8pm every night no matter where we are. If we are at a family event such as a wedding we found he slept on chairs in the disco room, woke up after a while, was abit active and finally went back to sleep at 11pm, once in a while doesn't hurt them. It's all about how you bring your children up to how you'll manage. Mine are brilliant! My eldest will comfort my youngest by cuddling, jabbering and kissing him. My youngest will watch while I play games with my eldest.
Good luck though because it can be hard at times but definitely rewarding x