It's blue now since the little boy has turned 5 already.
The last milk can we bought was still with the green cover for those ages 3-5. Now I suggested to hubby we should buy a new can since that last can had been open for more than a month already. We usually consume it in less than a month but since that time when he would not drink milk as much and opt to eat instead, it then lengthened the time to consume that last milk can was consumed.
Now his milk can has leveled up to this blue one now. He said "Wow!" when he saw this new color. You know kids are awed even with just simple things like this.