Hi... May I know how many months is your baby? Parents can safely start using pillows for children who are 1½ years old, about the same age at which parents can safely move children out of the crib and either into a toddler bed or onto a mattress on the floor.
She's about 2month. My baby is using small baby pillow.
If your baby is sleeping in the cot, try to put some blankets or pillow under the mattress and make it slanted, instead of letting LO sleep in the pillow.
My girl was a colic and reflux baby, this is what we did, recommended by PD.
Tan Ye Wei