"Early setback" refers to a problem or difficulty that occurs at the beginning of a task, project, or journey. It is an obstacle that arises early on and may hinder progress or success. Full definition
You managed to overcome early setbacks in your research career, perhaps because the end goal — your PhD or a paper — was so valuable. (sciencemag.org)
Despite early setbacks, a new flurry of interest in the paperless office. (legaltalknetwork.com)
It is difficult and costly to correct discrepancies in achievement that result from early setbacks, and much easier and more efficient to invest in early development of skills. (naesp.org)