At one month old, Beagle puppies are still nursing, and their size is quite small. By two months, they gradually begin to wean and develop their milk teeth. At three months, a Beagle's quality and traits can be assessed based on their appearance. The period from four to eight months is when they experience rapid growth. By nine to twelve months, the Beagle's size typically stabilizes.
Beagle puppies at one month are still in the pre-weaning stage and are relatively small. At this stage, the typical characteristics of Beagles are not fully developed yet, and they often appear rounded. By two months, the weaning process begins, and their weight increases noticeably, and they will begin to grow their milk teeth, and their limbs start to lengthen. By three months of age, the quality of the Beagle can generally be determined based on their physical traits. The period from four to eight months is a rapid growth phase for Beagles. During this time, they might experience teething. In male Beagles, the testicles will descend into the scrotum. Between nine and twelve months, a Beagle's size usually does not change drastically, and their physique generally stabilizes. Only changes in diet and exercise might cause some weight gain or loss. Consistent exercise and a balanced diet are essential during a Beagle's first year for healthy development and to maintain a healthy Beagle growth.