A new large-scale study published in the Lancet found that taking acetaminophen (paracetamol, Tylenol) during pregnancy does not increase the risk of autism, ADHD or intellectual disability in children[1][2]. A research team analyzed 43 studies with more than 300,000 pregnancy records and found no association between acetaminophen use during pregnancy and a diagnosis of autism in children[5]. Similarly, the association with ADHD (more than 400,000 records were examined) or intellectual disability (more than 500,000 records) was not confirmed[5]. The study focused on the largest and highest quality studies that controlled for genetic factors, particularly through sibling analysis[2]. Researchers stress that acetaminophen remains a safe choice during pregnancy when taken as directed—at the right dose, for the right amount of time, and as often as possible[1]. This study directly contradicts the September 2025 statement by US health authorities, who, based on another analysis, advised pregnant women to avoid acetaminophen[2][5].