there was no information available about Walker Hayes losing his seventh child. It's essential to recognize that my information might be outdated, and I might not have access to the most recent news.
If there have been developments or personal events in Walker Hayes' life that occurred , I would not have information on how he specifically maintained his sobriety during that time.
If you are interested in knowing more about Walker Hayes' personal journey or how he has coped with challenges in his life, I would recommend checking more recent and reliable sources, such as interviews, news articles, or official statements made by the artist himself. Personal journeys and experiences with sobriety are unique to each individual, and it's best to hear such information directly from the person involved or reputable sources.