Anyone lose too much weight and begin to dry out?

With my first baby I made it a year but couldn’t pump enough for daycare around 10 months due to a stomach bug and really dropping weight. (Lowest I’ve been since high school)

I’m not as low as I was when I had to begin to wean with the first but I’m about 5 lbs away from it. I am eating plenty. The weight keeps steadily dropping. (I am running after a nearly two year old and 3 month old.) Snacking is hard to do because my toddler wants whatever I am eating.