There have been threads about this lately as there have been massive probs with maternity allowance.
Basically instead of having 1 person at each jobcentre that deals with the MA claims, they have now centralised it and cut the staff by over half, causing a massive backlog. I claimed in June and have been told to expect the first payments around the end of November, although I will get a lump sum once its paid out to make up for the missing payments.
Ive been chasing mine every week as me and OH are struggling to pay the bills on just his wage but I keep getting told the same thing. Last I heard they were still following up claims from April so theyve still got May to get through before they even look at my claim!
You will recieve a letter about 6 weeks after you claim to let you know about all of this but theres no harm in chasing it still
xx