Today, 06:13 PM
There are many, many, many differences between bottle feeding and nursing. They are two completely different things.
But I think what you are asking is, if all baby needs is more breastmilk, why with a bottle and not the breast? And I completely agree with you. In many cases, encouraging a baby to nurse more often will solve slow gain issues.
But you have already said that your baby is nursing all the time. So I assumed this was not one of those cases. If it is true baby is nursing as much as baby possibly can and not gaining well, then the issue is that baby is not getting ENOUGH breastmilk at the breast. And the solution would be to try to get more milk into baby while you figure out why that is. If enough expressed breastmilk is not available, then formula is appropriate. But again, you will need to pump for every tiome baby gets a supplement, or as close t othat as you possibly can. That should generate some expressed milk, which can be given to baby instead of formula. Also, If your baby is not getting enough milk, the reason why must be discovered so the problem can be addressed. If baby IS getting enough milk and not gaining well, that indicates something else may be wrong.
So, assuming there is some available, you could supplement with your breastmilk or formula. Formula is not a "better" supplement when a baby is not gaining. Formula is made to be the same as breastmilk as far as calories. Manufacturers try very hard to match breastmilk in the few areas...