The commenter quotes research examining maternal mobile-phone use and children's behavioral outcomes, inc…

https://pmc.ncbi.nlm.nih.gov/articles/PMC5506372/pdf/nihms866566.pdf

"Methods—We used individual participant data from 83,884 mother-child pairs in the five cohorts

from Denmark (1996–2002), Korea (2006–2011), the Netherlands (2003–2004), Norway (2004–

2008), and Spain (2003–2008). We categorized cell phone use into none, low, medium, and high,

based on frequency of calls during pregnancy reported by the mothers. Child behavioral problems

(reported by mothers using the Strengths and Difficulties Questionnaire or Child Behavior

Checklist) were classified in the borderline/clinical and clinical ranges using validated cut-offs in

children aged 5–7 years. Cohort specific risk estimates were meta-analyzed.

Results—Overall, 38.8% of mothers, mostly from the Danish cohort, reported no cell phone use

during pregnancy and these mothers were less likely to have a child with overall behavioral,

hyperactivity/inattention or emotional problems. Evidence for a trend of increasing risk of child

behavioral problems through the maternal cell phone use categories was observed for

hyperactivity/inattention problems (OR for problems in the clinical range: 1.11, 95%CI 1.01, 1.22;

1.28, 95%CI 1.12, 1.48, among children of medium and high users, respectively). This association

was fairly consistent across cohorts and between cohorts with retrospectively and prospectively

collected cell phone use data.

Conclusions—Maternal cell phone use during pregnancy may be associated with an increased

risk for behavioral problems, particularly hyperactivity/inattention problems, in the offspring. The

interpretation of these results is unclear as uncontrolled confounding may influence both maternal

cell phone use and child behavioral problems."