Aww, first-time mom worries, totally get it! Para sa safety, better check with your pedia agad about that pillow, lalo na at 4 months pa lang, maraming pediatricians may specific guidelines for baby's sleeping setup. A few of us moms usually ask our doctor kung safe na ba certain items bago i-regular gamit, kaya don't hesitate to message your clinic or bring it sa next check-up para ma-assure ka. You're doing great by being careful!