Jean piaget's four stages of development, in the correct order, are:

Jean Pagets's four stages of developments are :

1. Sensorimotor ( at age 18 - 24 months)
a stage where infants are only aware of what is immidiatelt in front of them . They only focus on what they see , but they still don't understand how things react.

2. Preoperational stage ( 24 months to 7 years old)
In this stage, most of the kids already develop memory and imagination. Which make them understand the timeline between past, present, and future and make a imagination world in their heads. Their language begin to mature, and their intuition become a lot better

3. Concrete Operational stage (ages 7 - 11)
They become extremely aware of external events and started to demonstrate logicl, concrete reasoning. They become to realize that their personal thought and feelings are unique

4. Formal Operational stage ( age 11 and beyond)
They can think about multiple variable in systematic ways, formulate hypothesis, and consider possibilities

I hope this helps

Nothing will delay it, but drinking some lemon (squeeze 3) would cut it, making it last a few days, but its not good to do that. won't hurt you but the next month will be more cramps.. take some advils with you on the trip