I dont know what to make of DH’s behaviour

[Leilalala]

We are new parents to a 3-month old DS. DH on the whole is a caring and thoughtful person. Always sends birthday/Christmas cards to friends & family, makes a lot of effort on special occasions etc
He has been under some work related stress lately plus the obvious stress relating to being a new father so maybe a bit more cranky/tired/withdrawn than normal.
About a week ago he raised the subject of the upcoming Mothering Sunday (in 2 week’s time from then) and asked what I would like to do. I confirmed that I would really like to spend my first Mother’s Day with him and DS and go for lunch somewhere but also that he should make effort to see his mum and not just drop her just because we’ve had a baby (they always see each other on Mother’s Day). He said he wasn’t going to go see her initially but agreed he would do so in the morning before we do sth together as a family.
Today his dad called him to ‘discuss Sunday’ but DH asked him to call tomorrow. Over dinner I asked DH what they are thinking of doing with his mum (ie coffee/walk) and DH said that he will need to speak to his dad later as he hasn’t decided. I then asked what we are doing (thinking he has arranged this - he is very well organised normally) and he said ‘I don’t know’. I asked if he was going to book us into a restaurant and his response was ‘they will all be booked up by now, so there is no point’. I was shocked by his behaviour (him being quite indifferent and then dismissive about my first Mother’s Day having brought up the subject himself just a week earlier) and suggested that I try to find somewhere. He snapped out of it after that and apologised for his behaviour but I cannot help feeling uneasy about such out- of- character behaviour. It’s like his mask has slipped and this ‘ I can’t be bothered with you’ attitude shone through right then.
Am I overthinking this? Why would he be like this all of the sudden?
He obviously felt guilty as he went upstairs after dinner and when he came back down he said we are all booked in.
I can’t help feeling uncomfortable about tat exchange though.

Neither of you are wrong and he wasn't purposely being uncaring. He showed you how he is when he stuffs up and doesn't want you to know he stuffed up. Embarrassed by his behaviour, he thought he'd fixed it by being practical making a booking.
No two people communicate smoothly at all times and I hope you have a lovely mother's day together.

I realise this is old but I wanted to give my tuppence worth.

Under pressure, to book a table at a restaurant? Come on people, how hard is it to dial the number and say u want to book a table for 2 adults and 1 baby? You are all too busy calling OP needy and making excuses for dad.

So what if mothers day is overhyped, a gimmick etc op clearly wanted to celebrate it so our opinions don't count.

To be fair she recently passed a human out of her vagina and is now presumably sleep deprived and may, like many of us, be battling the wonders of peeing when we cough, weight loss, stretch marks, no clothes fitting, sore boobs, constipation, and so on.

He just couldn't be arsed to call a restaurant on the one day when he is meant to show a bit of bloody thanks. That's all he had to do. And he didn't.

So no you are not BU. You just have vaguely decent standards of how want to be treated. He realised he'd messed up luckily and sorted it.