Hi mama! I noticed your baby's sleep is a bit on the shorter side compared sa usual for 3 months, kaya I'd really suggest bringing this up with your pedia sa next check-up para ma-check kung okay lang talaga or if there's something going on. A few of my mum friends had similar concerns and their doctors helped figure out if baby needed adjustments in feeding schedule or if there was discomfort keeping them awake, sometimes it's something simple like reflux or gas na affecting sleep. In the meantime, try to observe din kung active and happy pa rin ang baby during the day, pero definitely get your doc's input dahil 12-13 hours is consistently below the recommended range at at 3 months that's worth checking!