What to do?! She’s 3 weeks


My baby girl is 3 weeks old today for the last 3 days she’s had very watery poo it’s a light brown /dark yellow colour shes formula fed she’s still drinking her normal amount and don’t have a fever I’m not sure what else is wrong at first I thought maybe the formula but she’s been on it for 3 weeks with no problems at al I keep massaging her stomach cause I know it may very well be stomach ache is there anything else I can do to comfort her ? She’s been really fussy wanting to eat more and won’t settle in her Moses basket only when she’s laid on my shoulder or chest