According to Ingrid Seward of Majestic the baby is due around August 8th (due date).
Prince and Princess Michael will fly to LA in the first week of August
No news yet on Frederick and Sophie Windsor's baby? I know it was due August 8 - looking forward to someone so far up the line of succession being American by birth!
On Twitter
Joe Little @MajestyMagazine 2h
In Los Angeles, Lord and Lady Frederick Windsor await the arrival of their firstborn. He or she is now three days overdue. #RoyalBabyWatch2