My 4 months baby has stabtisum on her eye.what exactly is that?

Stabtisum: This word as spelled is not a medical term. I suspect you mean either astigmatism (a type of refractive error of the eye which may ultimately require glasses) or strabismus (crossed eyes). Crossed eyes are common in infants up to 9 months, can be either intermittent or constant; it often corrects on its own as muscular coordination improves. If not resolved by 1 year of age, it will need surgery.

Lazy eyed: Strabismus is evidence that at least one eye muscle is not doing its job properly. You need to see an eye doctor.

Words matter: As written, "strabtisum" is not a real medical word/condition but is similar to strabismus, a condition where the eyes cross.This happens when the baby's eye muscles are not holding the focus of both eyes on the same focal point.This can be from a weak muscle, a nerve problem or an eye problem.You will need to work with the babies eye doctor to find a way to fix it.It is common & many respond well