三聚氰氨 (Melamine) is a white and monoclinic crystal use in making melamine resins.
It is harmful to eyes and our skin and with highly toxic to swallow, and which means all organism ate this chemical will be affected.
In my opinion, baby will suffer the most as they are still growing and this little crystal would badly destroy their growing and cause illness in the future.
As according to the news:
Slightly effect: Painful during urination
Medium: Forming stones in kidney
Severe effect: Unable to urinate, poisoning; or too much melamine in blood and cause death.