Relationship advice

So we are 3 months into our second daughter (our first one being 2). This time round it's hit us hard, we've both struggled adapting to multiples. However we've been getting more and more frustrated with one another the past couple of weeks. He has his own business and is super busy all the time. Which means I take on the brunt of the hard work with both children. I do everything for the baby, he does help with the toddler. He hasn't done any night feeds and admits he struggles with the newborn stage so it sort of all landed on my lap unofficially. He gets his weekly game nights back now whereas I'm still working around our 3 month old and going to bed early so I'm able to do the night feeds. I know he is bogged down with work but this just seems unfair at times. I have spoken to him before in a round about way but nothing changes really and he just has no patience dealing with the newborn part so I just don't even feel comfortable with him doing it even if he wanted to at this point. I'm just after some idea of how others would take this. Am I being unreasonable or am I right in thinking he should still muck in even if he is busy with work. It's not a 9-5 job he does have to come home and continue to work on the admin side of the business.