That's interesting! - I'd class any child aged 0-2 as a 'baby', whether they were 2 days or 2 years old. Any child aged 5+ would definitely be an older child for me, I go back and forth on whether 4 is "older" or not. I certaninly wouldn't class a 3 year old as an older child
Anyway, thank you
I don't think I've done anything to be saluted for, but I'm pleased that this board is a place which is eye opening/educational. Hopefully it's also positive - there are all lots of wonderful things about older child adoption as well 
How relinquishing a baby goes in the UK - a mother can't sign papers allowing her baby to be placed for adoption until at least 6 weeks post birth. After that, she can still change her mind. The baby would be in foster care for a while, probably a few months. If the mother changed her mind while the baby was in foster care, SS have 7 days to return the baby to her. If they thought that the baby would come to significant harm in her care, they could apply to court within those 7 days for a care order. Once the local authority have identified adoptive parents, the baby would move in with them, and would probably be somewhere 4 months + old by this time. If the birth mum changes her mind once the baby has been placed with adopters, SS have 14 days to return the baby to her. Again, if they thought the baby would come to harm with her, they could apply for a care order and placement order (this is the legal order which allows a child to be placed in the home of people who are only approved as adoptive parents) in that time.
In England/Wales, adoptive parents can apply to court for an adoption order after the child has lived with them for at least 10 weeks. Once they have put the application in, the birth mum can no longer have her baby back if she changes her mind. The birth mum would have to wait the few months until the court hearing, then oppose their adoption application in court. Chances of succes would be low at that point.
Does that make sense?