This has been going on pre children and was causing tensions before, but unfortunately the OP took the chance that getting pregnant would make him prioritise her.
He hasn't.
The tension has increased and now resentment has start to set in.
His response is to punish the OP with sulking and silent behaviour.
This is the OP's life now.
His mother will continue to be his priority ahead of his new child and the OP as new mother.
Men like this do what is best for them and their mum's.
Unfortunately until the OP wakes up to this and starts to take firm action this will be her sad life......
Bullied and emotionally abused by a punishing husband who is determined that his mother comes first and will treat her badly if she objects.
It usually doesn't get any better.
MN is full of threads from women whom deeply regret marrying and having children with mummys boys.
Lots of men love their mothers dearly but can do so and still have a healthy relationship with their wives.
His sulking and silent treatment to punish his pregnant wife is a huge red flag and the OP ignores this terrible treatment of her at her peril.
When her new baby arrives, expect his mother there constantly, pushing her way in and her husband standing silently by.
New mothers like the OP are hugely vulnerable to PND due to the stress of all of this.
OP, keep your parents very close.
Tell them the truth.
Move home asap.
Or be ready to move with the baby.
Do not allow your mummy boy husband and his pushy mother destroy this time with your baby.
Also I would strongly suggest you search for threads on this subject so that you are prepared for what may lay ahead for you.
Really wishing you the very best.