18 months of age can be the start to introduce pillow with supervision po. Can use pillow that is smaller than the baby to avoid SIDS or soft kind so not to be used as a step to climb playpens or cribs or can be flat if its used for sleeping. My baby has a banana pillow used for hugging and biting only and not used for sleeping.
1 year old no need pillows. They are different from us. However, if you choose to give a pillow. Id say its okay. But it's not a need. My boy has a pillow.
Not a need. Choose a soft pillow or. Those buckwheat pillow is good