My son who is 2 years old has one testicle that is slightly larger than the other. we noticed it about 2 weeks ago but the decreased over the last 2 weeks.

Doctor can examine: His pediatrician can take a look to decide what to do. Testes don't have to be matching in size exactly, but if one is a lot bigger than the other, then something may be wrong with either the one that is too huge or the one that is too tiny. If a 2 year-old's testis is an egg-shaped thing that is sometimes bigger and sometimes smaller, it may have fluid around it, which is treated by a surgery.