Definitely. Uneven breast growth is normal. Most breast development begins on one side first, and might continue to be uneven through puberty. Most of the time the difference is not noticeable, but
Teen with uneven breast development
Breast Asymmetry: Causes and Diagnosis
PDF) Unilateral Virginal Breast Hypertrophy in an 11-year-old Girl
Is inconsistent breast development normal? : r/MtF
Normal Breast Development and Changes
I only grew one boob — and it's a real medical condition
Why Is One Breast Bigger Than the Other?
Breast Asymmetry: Causes and Diagnosis
Uneven Breasts - HealthyWomen
Breast Development - baby, stages, average, Definition, Description, Common problems
I only grew one boob — and it's a real medical condition
There was axillary hair and her breasts were fully developed and
Sisters, not twins': What a doctor says about having different sizes of breasts
breast » Girlology, Inc.
Breast Health: Follow-up after an abnormal mammogram - NCI