GMA First Look Full Broadcast - Sept. 23, 2025

President Donald Trump on Monday used the platform of the presidency to promote unproven and, in some cases, discredited ties between Tylenol, vaccines and autism as his administration announced a wide-ranging effort to study the causes of the complex brain. Elizabeth Schulze has the details; Perry Russom reports on one corner of TikTok claiming that the end is near, and the surprising origin of this theory; Danny New profiles a group of dads who are using their babies to stay fit and to become better parents; and more on ABC’s GMA First Look. SUBSCRIBE to GMA: https://youtube.com/@GMA?si=ka34lqdEy... SIGN UP to get the daily GMA Wake-Up Newsletter: https://tinyurl.com/yc34mz6t To read the full story and others, visit http://www.goodmorningamerica.com FOLLOW: TikTok:   / gma   Instagram:   / goodmorningamerica   Facebook:   / goodmorningamerica   Threads: https://www.threads.net/@goodmorninga... X:   / gma   Watch full episodes of GMA: https://abcnews.link/8SAXtIX Watch full episodes of GMA3: https://abcnews.link/8aZfnmd Watch full episodes of GMA First Look: https://abcnews.link/LxV2S7H