Hello girls, who in what infant age up to 6 months gave antibiotics? M…

Hello girls, who in what infant age up to 6 months gave antibiotics? My pediatrician in Moscow did not prescribe probiotics. And we've been drinking antibiotics for a month since we started, stool is not normal at first it's normal pooping, then immediately watery and it's not possible to poop normally, crying every time, monthly already with someone had this?