I had my first child only 13 months ago and I am now pregnant again. Is this too early, and may it result in pregnancy complications?

Theoretically your body is ready for another pregnancy when your menstrual cycle resumes after childbirth. If your first pregnancy was uncomplicated and your health in general has been normal, then 13 months is more than enough time. If however, your previous pregnancy was complicated and depending on the type of complications, it is important to consult with your Obstetrician about any time related restrictions that may exist.