Unfortunately, chocolate can cause digestive distress in some little kids, and the first birthday party should not be remembered for a tummy ache!
The real fun of that first cake is watching your toddler make a mess. If chocolate cake is a favorite with your family, I suggest having a cake that is half chocolate, half white and letting the birthday boy play in the vanilla side. That way, you can literally have your cake and eat it, too!
Our parenting advice is given as suggestions only. We recommend you also consult your healthcare provider, and urge you to contact them immediately if your question is urgent or about a medical condition.