Teacups are a few months old

The Teacup Dog starts to set at 6 months of age, when its growth stops and it continues to maintain that size. The Teacup is a genetic variant of the breed and is in a different state of health and has a shorter life span than other dogs. The Teacup grows at the same rate as other dogs from birth to 4 months of age, but after 4 months the dog reaches a slow growth period and begins to stop growing at 6 months of age. During the growth and development of the Teacup, it is important to get enough nutrition to avoid stunting. Because of their small size, most Teacups face difficult births when they are bred, such as oversized fetuses, overly narrow birth canals, and inability to deliver.