Neonatal factors in infants with Autistic Disorder and typically developing infants.
Baby boys later diagnosed with autism often had longer pregnancies and higher birth weights, while both sexes had more newborn medical issues than typical babies.
01Research in Context
What this study did
Sugie et al. (2005) compared birth records of babies later diagnosed with autism to typical babies.
They looked at gestation length, birth weight, and any medical problems right after birth.
The study focused on sex differences within these early life factors.
What they found
Baby boys who later had autism stayed in the womb longer and weighed more at birth than typical boys.
Both boys and girls with autism had more medical complications as newborns than their peers.
The results showed mixed patterns depending on the baby's sex.
How this fits with other research
Bassett-Gunter et al. (2017) seems to disagree at first glance. They found no real sex differences in autism symptoms among 679 people. But this study looked at diagnosed individuals across the lifespan, not babies. The contradiction disappears when you see they studied different age groups.
Mandy et al. (2012) extends these findings into childhood. They showed girls with autism have milder repetitive behaviors than boys. This builds on Yoko's neonatal sex differences by tracking how sex affects autism presentation as kids grow.
Fusar-Poli et al. (2017) synthesized multiple studies and confirmed that sex differences in autism traits mirror those in the general population. This supports Yoko's finding that biological sex matters from birth onward.
Why it matters
These findings remind you that boys and girls with autism can look different from day one. When reviewing birth histories, note that boys might have had longer pregnancies and higher birth weights. This early information can help you understand each child's unique profile. Don't assume all autistic kids had the same start in life - the sex differences begin before diagnosis and continue throughout development.
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02At a glance
03Original abstract
The prenatal and neonatal factors of 225 children diagnosed with Autistic Disorder were compared with those of 1580 typically developing children. Each of the neonatal factors was compared between the Autistic Disorder and control groups, and between males and females. The results showed that males in the 'Autistic Disorder' group had a significantly longer gestational age and a heavier birth weight than the male controls. No significant differences in these factors were observed between females in the two groups. Both male and female children with Autistic Disorder showed a significantly higher incidence of neonatal complications than their respective controls. In the Autistic Disorder group, males had a heavier mean birth weight, and there were more post-term infants among females.
Autism : the international journal of research and practice, 2005 · doi:10.1177/1362361305057877