As he gets older, the ideal thing is for a child to know their body's cues... for hunger or fulness. And to be allowed, to eat when hungry or stop when full.... per their body's cues. Of which, everyone has different appetites and levels of knowing when they are full.
And kids, also need to snack throughout the day. Grazing. My son is like that. He eats little at a time and grazes. So does my Husband, They are just that way. But my kids KNOW their body's cues, not eating out of emotion nor because they are getting more food put to their mouth, or because the tv is on or off.
The tv, does not impact my kids eating.
Every house is different.
Did your Doc say to give him 2 less bottles a day?
Every child is different.
Does his 2 less bottles a day make him eat more solids? Or not?
Some kids, grow like weeds and hit growth-spurts and need more intake, per their body. For my kids, I gave them milk as they needed. In a cup or straw cup. And they ate food too. I never quantified it nor had a rigid feeding schedule. Fed on demand. Especially at growth-spurts, they get hungrier more often. And they grew like weeds and were/are very lean and solid and tall. They got the intake they needed. They ate when hungry and stopped when full. By their cues.
Sorry for my roundabout answer.
But, that is my take on it. And what I do with my kids.
Your son, is going to hit a growth-spurt. 15 months is a growth-spurt.
Distraction may make a child eat more. But the thing is: is the kid full or not? Or does he want to eat more or can he? Or is it just that the child has to eat everything on his plate?
And kids this age, do easily get distracted.
At that age I also let my kids feed themselves to the best of their ability and then helping when needed. And they hated being in a high chair. They just sat at the table in a booster attached to the chair.