Why would she say this…

My MIL called me just now and asked me when am I gonna use formula… my baby is fresh out lol we’re just getting the hang of things. Idk if she’s testing me. Cuz she breast fed her two kids and should know you don’t need formula as long as everything is going well. But if baby is ebf why would I need formula?? She said oh so the breast milk will fill his tummy??? What else will?? Her tone was so condescending too. (Ps my first born was only formula fed I don’t have anything against it.💕)