Autism in babies happens because of differences in how the brain develops and works, influenced by both genes and environment. It’s not caused by one single thing but rather a mix of factors:
🔹 1. Genetic reasons
Autism often runs in families.
Certain genes affect brain connections, communication, and social development.
Sometimes, new genetic changes (not inherited) appear during pregnancy.
🔹 2. Brain development differences
In the womb, a baby’s brain grows very quickly.
In autism, some brain areas develop differently, affecting speech, emotions, and learning.
🔹 3. Pregnancy & birth factors (environmental)
These don’t cause autism alone but may increase risk if genes are involved:
Older mother or father.
Premature birth or very low birth weight.
Complications during delivery.
Mother’s illness, infection, or certain medicines during pregnancy.
🔹 4. What does not cause autism
Vaccines do not cause autism (scientifically proven).
Parenting style or lack of love is not a cause.
🍼 Why it shows in babies
Babies with autism are usually born healthy.
Signs often appear between 12–24 months, like:
Limited eye contact
Not responding to name
Delayed speech
Repetitive movements
👉 In simple words: Autism happens in babies because their brains develop differently due to a combination of genes and pregnancy-related factors, not because of something parents did wrong.