I'm married and we have 2 boys 15 & 12 and our almost 4 month old daughter our rainbow baby. And I…

I'm married and we have 2 boys 15 & 12 and our almost 4 month old daughter our rainbow baby. And I watch our daughter all by myself with hardly never any breaks. 😣😣 I am starting to get burnt out. 😴😴 How can I talk to my SO about helping me more with our daughter without exploding 💣💣 PLEASE HELP!!!!!