Are you breastfeeding or formula feeding your baby?
By 3 months of age, babies get good at sucking in a short span baby gets full.
If she is getting distracted, I would suggest you feed her in a separate, quiet room with minimal distractions.
Ensure the number of times she is passing urine, if she is passing urine once every 3-4 hours. No need to worry.
Next Steps
Monitor if urine count is normal and if baby is gaining weight.
Health Tips
Burp the baby by holding upright for at-least 10-15 mins post every feed.