Hello mam...I have gone through your queries...I would better suggest not to put baby in the same mattress and nearby you while you are sleeping till baby grows till 6 months of age..since you may compress the baby accidentaly while you are sleeping..so better avoid mam...
Next Steps
Better make the baby sleep in other mattress nearby you...pilllows are not needed..just elevate baby's head to 25 degree inclined...just by keeping some towel rolled behind the lower portion of head...it might help to overcome the Reflux in babies..