What milestones do your babies have down?

J • Rainbow baby arrived June 2019 💕 baby brother arrived September 2020 💙 tie breaker arriving November 2022 💚💜

I feel like my blob is behind. She refuses to do tummy time and will roll to her back. She will not roll back to stomach, but will do side to side, and we just started to sit unassisted. Sitting only last about a minute or so. Idk why but I feel like maybe shes behind because shes not rolling? Doesnt do tummy time so there is no interest in trying to crawl. Also, she has only laughed maybe 5 times but she smiles all the time. Blah. Parenting is stressful