Crib to bed

Lib

When did you transfer your toddler from a crib to bed? My son is 16 months and daughter is nearly 3 months. We are going to be transitioning our daughter at 6 months into the same room as her brother (like we transitions our boy into his own room at that age)

But we want to not buy a new cot and use our cot currently (that turns into a bed) for our daughter. And buy our son a toddler bed. As it works better for space...