Girls, all of you Happy New Year! ????? I wanted to ask, we're a month…

Girls, all of you Happy New Year! ????? I wanted to ask, we're a month in, and the baby was eating a lot of milk for this whole time, but now for the last 2-3 days it seems like there's not much milk left. I can see that the little one isn't eating well. We're completely breastfeeding, has anyone encountered something similar? Or is it temporary? I don't want to supplement with formula... ??