Children could be involved in a developmental activity but come to harm because of lack of parental supervision during that activity, or letting them take part in a developmental activity for which the child is not prepared or letting them take part in a developmental activity which is not age related.
And who is to decide an appropriate age for children to take part in some development activity.
Parents make differing choices and sometimes have to live with the consequences if their choice was wrong.
Leaving three babies - unattended is not an activity .... its abandoning them imo.
MADELEINE McCann’s parents were not prosecuted for abandoning their daughter
while they dined near by because of “compassion”, law chiefs have claimed.
Portuguese officials thought Brits had “peculiar customs” where it was “natural
for them to leave the two-year-old twin siblings and the other
three-year-old child alone”.
Former minister of internal affairs Rui Pereira slammed Portuguese cops for
not making Kate, 48, and 47-year-old dad Gerry suspects for abandonment.Madeleine, who was three at the time, was left sleeping in the family’s
holiday apartment in the Algarve resort with her younger twin siblings as
her parents went for dinner with friends in a nearby restaurant.
https://www.thesun.co.uk/archives/news/1151476/revealed-why-the-portuguese-police-didnt-charge-mccanns-for-childrens-abandonment-after-maddie-disappeared/