Hi Tan, Izzy and Iggy are about the same age and we have started taking the cot side off during the day so he can try out no sides for a short sleep. We tried it overnight but got a few hours in and he had rolled off the cot (onto pillows) and then under the bed! And we hadn't even woken up! But the short sleeps seem to be no worries and he loves being able to get up from a nap and waddle out to see us.