Six-time Paralympian gold medalist David Weir has tweeted his excitement at the birth of his second son but he missed the birth because he is in Rio.
The 37-year-old and his wife Emily already have three children - Ronie, Tillia Grace and Mason.
Weir will race in the T54 400 metres heats at the Olympic Stadium later on Sunday.
The final takes place on Monday, and he is in 1500m heat action later on the same day.
Weir, from Wallington in Surrey, is competing in five events in Rio, including the marathon on next Sunday's final day.