Sleeping help 🥱

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My son is almost 5 months old. He’s exclusively breastfed and has been waiting up every 1.5-2hrs to eat all night long. This started about a month ago. Before that he could go 3-4hrs without waking. I’m dying of exhaustion here I also have 3 other kids to keep up with. Does anyone have any suggestions on what I can do/change/try anything to get him to sleep longer?