M.B.
I have twin 21 month olds and one of them is autistic. Not exactly 3 kids, but just as much work. The biggest obstacle you will have is in the beginning with the twins. I don't remember the first 6 months too well and have almost no recollection of the first 3 months because of the lack of sleep. If it is in your budget, hire a night nanny to get up and do the overnight feedings. Get those babies on a schedule from the beginning. I read a book that helped me. It might be expensive, but if you can get 7-8 hours of uninterrupted sleep, that will make all the difference in the world. Get your 19 month old to involved with the babies so that you can give him attention as well.