A man has been charged with the murder of a one-year-old boy and the attempted murder of a girl of the same age, Scotland Yard said.
Bidhya Sagar Das, 33, was arrested in east London on Sunday evening in connection with a "domestic incident".
He was charged in the early hours of Tuesday and will appear in custody at Thames Magistrates Court later.
Both toddlers were discovered with critical injuries at an address in Wilberforce Road, near Finsbury Park, north London on Saturday night.
They were taken to an east London hospital, where the boy died in the early hours of Sunday morning.
Scotland Yard said a post-mortem examination on the boy is scheduled to take place at a central London hospital on Tuesday.
The girl, who has not been named, remains in hospital in a critical condition.