She said National Registration Department figures showed 4,992 illegitimate children born last year, and 1,664 children so far this year.
Wan Azizah said 120 cases of baby dumping were recorded in 2017.
She said a study had shown that 35.3% of young people between 13 and 24 are exposed to pornography, with more than two-thirds of them viewing pornography through the internet (computers), smartphones and CD or DVDs.
Another study on adolescent sexual behaviour in Sabah and Sarawak in 2016 had found that among teenage schoolchildren who had confessed to having sex, 22% said it was a result of viewing pornographic material.
She called for greater control over young people using electronic gadgets, and better efforts to promote cyber-smart families.
Speaking at a forum on “Families Reject Pornography” at the teachers training institute, she said the fragility and fall of the family institution was getting alarming. Pornography, domestic violence and incest was the cause of children being born out of wedlock and also for baby dumping.
A study had shown that parents and their children communicated most through phone calls (73%), SMS (54.6%) and social media (15.6%).
Official figures showed that 81.8% of Malaysian households used broadband services in 2018, and 76.9% of Malaysians, or about 24.5 million people, had internet access.
“It’s undeniable that (internet) gadgets are the main communications medium now. However, uncontrolled usage of these gadgets can bring about negative implications especially the young, what more without parental supervision.”