I don’t have a for sure answer for you, but, I have found that if I make sure I feel balanced and make myself a priority it helps my sex drive. My Natropath doctor recommended continuing pre natals even post babies, as well as eating 20-30g protein for my hormones at every meal. I also added in Maca and Ashwagandha which I can tell you 10000% helps (husband also takes).
This is so common and relatable, life can be so exhausting with work, kids and balancing quality time!! I think it's important to have the conversation with your husband at a time where everyone is rested, and kids not around and make sure he is aware of how you feel!! We also started having a weekly date night which helped us spending quality time together, and also take the night off of putting kids to bed!!