Anyone tried using Tula insert for your babies? Till what age (month) was your baby in the insert and was your baby sweaty in it? I've a wc standard and was wondering if I should just wait for my baby to become older or get an insert.

Yes, it can be warm for baby. As for what age, depends on baby's size. Can be as early as 4 months old if baby is tall, can be as late as 8 to 9 months old if baby is small size. To stop using the infant insert, baby needs to fulfill 2 criteria: 1) Good neck control 2) Long enough legs such that legs won't be hyperextended. I've attached an example of hyperextended legs. The edge of the carrier fabric should end behind the knees, with no bunching up of fabric behind the knees. Legs have to be able to swing freely at the knees.