Mice were housed in cages with a 12:12 light:dark cycle and had access to food and water ad lib at all times unless indicated otherwise
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However, when the researchers adjusted for other things , including siblings with autism, the increased risk was no longer statistically significant .[ref][ref] (Note that other researchers point out bias in that paper.[ref]) Another large study published in 2021 involving 73,000 children and mothers found that there was a 19% increase in relative risk of ASD with prenatal acetaminophen exposure.[ref] A 2025 meta-analysis of studies on acetaminophen use during pregnancy and infancy shows that the majority of studies and the higher-quality studies show a positive association between acetaminophen use and ADHD, ASD, or neurodevelopmental disorders.[ref] A couple of things to consider here

In short, the gut microbiota influences brain function via the regulation of neurotransmitters and neurotrophic factors, maintenance of intestinal barrier and tight junction integrity, activation of enteric sensory afferents, production of bacterial metabolites, and modulation of mucosal immune responses [22]