LO constipation

Hey mummies, can anyone let me know how do i determine constipation for my lo? Initially she has very watery poop, then recently 2 days never poop. Today she did but it is like small pebble, when i press it, it feels like mashed potatoes. She passed motion like 3x today but then 2-3 small pebbles each, is this considered as constipation? She has been cranky the whole day today even after she poop