David Cameron said it was "about time" as he hailed the start of an £8 billion redevelopment of Battersea Power Station.
The Prime Minister visited the central London site - which has been lying unused since 1983 - with his Malaysian counterpart Datuk Seri Najib Razak.
Speaking with Mr Najib, the premier said: "This is a great day. It has been a long time to get the Battersea Power Station development going.
"It stopped producing power 30 years ago and it has taken this long to get off the ground. It needed your help".
More top news
The toddler was taken to hospital along with two girls, aged five and six, and a woman who was also injured.
London's smallest pub is set to start pulling its first pints in a shed in Greenwich.
A controlled explosion was carried out after officers were called earlier today to north Greenwich.