@Greensleeves
I don't understand all these posters saying he's taking advantage of his dp by expecting her to feed their baby while he's seeing to the other child; of course that's what should happen *
Taking care of one child's needs each IS sharing the load! He's parenting the older child while she's feeding the baby - that's the best and most obvious way for it to work at the moment with the needs the children have and the adults who are available to meet them.*
More of this 🙄 The children are not both hers so he is not equally sharing their load, she is fulfilling 100% of her responsibility plus 50% of his, and he is fulfilling 50% of his.
That is not equal, and he is relying on her to make up for him not balancing his two children fairly.
By choosing to have another child while he has another from a previous relationship, he should be agreeing to having to put in an extra level of effort due to his life choices to ensure he is parenting the child he is conceiving equally to his partner, unless he stipulated before they conceived that he would not be doing 50% of the work, and she agreed to it. It's not her responsibility to shoulder his burden.
And even if both children were biologically both of theirs, few would consider it equivalent for one parent to sleep through the night in a room with one child while the other wakes frequently with the other, every night. You would split the role that results in hardly any sleep equally.
If I were him and insisted on cosleeping with the older child every single weekend, then I wouldn't dream of doing so without offering to do some nights during the working week, because he has decided not to be available on the only nights he isn't working in this scenario.