As someone else is talking about them, I'll also talk about them.
ECPAT (short for "Every Child Protected Against Trafficking") isn't really a "child rights" group. It seems to be one of those "anti trafficking" groups. According to one activist, their founding seems to have included a merger of religiously motivated groups, this should come as a shock to precisely no one.
The so-called "anti-trafficking sector" tends to be extremely conservative (think of how they fundraise), criminal justice focused, relies on misleading (or outright false) data, tends to be religious, and doesn't take accountability for the "collateral damage" they dole out.
One of their advisers (a quite annoying person who has occasion argued with privacy activists) appears to be married to a politician from the British Conservative Party. He frequently makes incoherent (and paranoid) rants about the tech sector for not implementing whatever crazy rights violating idea that has been cooked up by someone. It's unclear whether he has any actual expertise in anything, none appears to be listed.
They have strong criminal justice associations (and they naturally advocate for maximum power, no safeguards, and no accountability for cops), and seem to also have strong associations with religiously motivated groups. I haven't seen them advocate *against* any sort of collateral damage, in any capacity, including to minors (remember, they don't actually care about their rights, only their screwed up ideology), which comes of their advocacy.