Night shift duty...

Karla
I am on maternity leave currently and my partner works 8am-5pm, typically M-F. Our baby girl will be a month old on Sunday. 
I care for her all day and we are a team during the evening shift (5-10pm). Since she was 2 weeks old I have done the night shift. I have had 1 1/2 nights where he has picked up the shift and I was able to sleep 5 or more non interrupted hours. 
I am starting to become extremely frustrated with my partner. I feel as though he thinks I do nothing all day (I also maintain the house, he does not help with any chores or care for our dogs) and when I ask for a night shift off he becomes defensive. 
I am curious to see if anyone agrees or disagrees with our current "understanding". I am also open to comments and suggestions. Thank you!

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