This is the most common question we get from people traveling to Cancun. From breast milk, to live animals, to medicine, to cigarettes, gift bags for your wedding, etc. If you are coming from ANY country outside of Mexico then there are limitations on what you can bring into Mexico. The same goes for what you can take OUT of Mexico. Because this is a CUSTOMS question it is better that you check with your nearest MEXICAN CONSULATE prior to your trip to Cancun. Here is a link to Mexican Consulates around the world:
Please be aware that we WILL NOT answer to emails regarding CUSTOMS questions as we are not authorized to give official information. Please contact your nearest Mexican Consulate for details and documentation.