Alah, tu normal je lah untuk baby fully breastfed, especially at 4 months! Breastfed babies memang ada loose, cair-cair stools, boleh 1-3 kali sehari atau kadang lebih, and as long as baby happy, feeding well, dan nappy output okay, you're good. A few of my mum friends were so worried about this masa first time, tapi pediatrician diorang kata "if baby is gaining weight and acting normal, don't worry", and yours sounds like she's thriving! Just keep an eye that it's not too runny-runny or kalau ada tanda dehydration (fewer wet nappies, very lethargic), then check with your doctor la.