For the most part there are practically no restrictions children face entering Colombia that adults would not face, but it should be noted that children can only bring goods worth up to half the value of the adult maximum (normally worth around $2500), but additionally, children are exempted from airport tax.
For pets to enter Colombia, pets must be vaccinated for Rabies, Distemper, Hepatitis, Leptospirosis and Parvovirus, unless under the age of four months in which case the former is not required. Then, within 8 days of travel a certified veterinarian must complete the Veterinary Certificate for Colombia (both an original and another in Spanish), the veterinarian must be accredited by the governmental authority of the exportation of animals for your country. This often means a Rabies Certificate must also be filled out. It’s highly recommended to both put your pet on a flea and tick prevention program and having your pet microchipped prior to entering Colombia.
The following breeds (and any cross breeds) of dog are banned in Colombia: