A boy injured when a tree fell on him at a zoo owned by TV presenter Anna Ryder Richardson has been transferred to a specialist children's unit.
The four-year-old is in intensive care at The University Hospital of Wales in Cardiff after being transferred from Morriston Hospital in Swansea.
Police and officials investigating the incident have returned to the Manor Wildlife Park in Pembrokeshire.
Council officers are due to meet a tree specialist at the site.
The boy and his 28-year-old mother from Llanelli, Carmarthenshire, were flown to Morriston Hospital by air ambulance on Tuesday.
At lunchtime on Wednesday, Dyfed-Powys Police said the pair were both in a "stable" condition.
The University Hospital of Wales said the boy was now being treated at their paediatric intensive care unit.
The park, at St Florence, near Tenby, is owned by TV celebrity Anna Ryder Richardson and her husband Colin MacDougall.
The couple issued a statement saying they were "absolutely devastated" by the incident and that their "only concern is for the little boy and his mother".
"Our thoughts are with them and their family," the couple said.
It is understood that the mother and son were on a day out at the park and were in or near the wallaby enclosure at around 1130 BST on Tuesday when the tree fell on them.
Visitor Jenny Davies said the incident was "shocking" but the emergency services arrived very quickly.
She said: "We'd just come out of the wallaby enclosure and as we were walking up the path away we heard an enormous crack and some terrible screams.
"And then we realised there'd been a horrible accident because a lot of people were running to the area to help and mums and children running trying to get out of the area."
Ambulance crews was called to the scene, followed by firefighters from Tenby, who had to lift the tree off the woman and child before they could be treated.
The boy was found to have suffered a serious head injury, while his mother had injuries to her head, leg, pelvis and arm.
The wildlife park covers about 50 acres, and is home to exotic animals such as zebras, monkeys and rhinos, and also has a large play area for children.
Since Anna Ryder Richardson bought it in 2008, she and her team have been working to change it into an "uncaged" wildlife attraction where traditional pens are replaced with walk-through areas.
A Channel 4 series called Chaos at the Zoo, and a BBC1 Wales series called Wild Welsh Zoo have been made at the park.
A new six-part television series called Anna's Welsh Zoo was due to begin on ITV Wales next Tuesday but the channel has now decided to pull the programme until a later date.
A spokesman for ITV Wales said: "Due to the recent accident at the Manor House Wildlife Park in Pembrokeshire, ITV Wales has decided to reschedule its series on the park to a date later in the year."