Caring for 2 one year olds?

[Artsand crafts]

The maximum amount of 1 years old (between 8 to 15 mos) I have had is 4 (including my son). It wasn't that bad since they started some weeks or months apart and when the next ones started the ones already here were used to the routine and our ways. They started during spring so I did not have to worry about snow suits. However, I recently (June) transitioned three 1 year olds on the same date (only one of them one week before) and that was real a pain in the behind. The crying and fussing was multiplied by three at the same time. After 4 or 6 weeks everything went to quiet. I hired an assistant to come in the mornings during transition days so the older ones did not have to miss out outdoor time because of the little ones and me neither since it was the time when I needed fresh air the most. She was such a great help.