Some people don’t feel heaviness until milk is not collected enough and baby was not feeding regularly.
If the baby feeding regularly no heaviness or emptiness is felt. Baby weight is okay.
Main thing in proper feeding is position how you hold the baby if you’re holding by two hands I.e body one hand and head with one hand it’s wrong. It causes neck pain and the baby cannot adequately feed as it is 15-20 minutes.
Only then fore milk gets emptied in 5 minutes and hind milk get emptied by 20 minutes of feeding per breast.
Next hive other breast for 15-20 minutes.
Next Steps
Gas passing is normal in second moth
Health Tips
Passing motions after feed is a good sign nothing wrong. Hope this helps.