Factual error: The movie depicted the use of obstetrical ultrasound. While ultrasound was first "perfected" in the late 1950s, it wasn't used in British hospitals until the 1970s and not in US hospitals until well into the 1970s, well past the setting of the movie in the 1960s.
Continuity mistake: When she is watching General hospital, the baby in the crib has no shirt on. When the TV goes off and the baby is crying the child has a shirt.
Factual error: This movie takes place in the late 60s to early 70s. There is a shot of a crayon rolling across the floor, and the logo on it is the one Crayola used in the 80s.
Answer: We are never told who the children are they are probably just some children who live in the apartment.