Season 8, Episode 4:
What a surprise that Doctor Who: The Aztecs was on television at Nonnatus House and what a fan Sister Monica Joan is of the First Doctor William Hartnell.
This comes just months after Call The Midwife was referenced in The Tsuranga Conundrum.
In a funny coincidence I was reading my comments on The Tsuranga Conundrum including the said Call The Midwife reference just before coming across the Doctor Who viewing in Call The Midwife.
This Call The Midwife episode is co-written by an Amy Roberts and does not seem to be the same Amy Roberts who was costume designer of Doctor Who between 1977 and 1983.
This episode guest starred Niky Wardley who had played Eighth Doctor Big Finish companion Tamsin Drew made canonical by The Night of the Doctor.
In addition to this whether this was intended as a further Who reference there is a couple here with the surname of Tennant. Perhaps named after Tenth Doctor David Tennant.
Niky Wardley played Enid Wilson and she and her adult daughter are both pregnant.
No doubt it is bizarre for anyone to be born at the same time of an uncle or aunt.