There is no way, a baby sleeps the same ALL the time everyday or night, regardless if they are sleep trained or not.
ALL babies, go through varying appetites everyday, and growth spurts and teething and these things often occur at the same time.
When 9 months old, this is a growth spurt time. Their needs for intake increases and more frequently. For the 1st year of life... a baby's PRIMARY source of nutrition is breastmilk or Formula, and it needs to be given on demand, in order to supply the baby with what they need.
Solids, is not nutritionally adequate. Feeding by a schedule, does not work, because everyday, a baby's needs for intake varies. So feed breastmilk/Formula when baby needs it. And that is 24/7, day and night.
For the 1st year of life, breastmilk/Formula is a building block need for development.
This is all per our Pediatrician as well.
If a baby is hitting a growth spurt, and breastfeeding/Formula does not keep up with baby's needs, they will not be getting what they need. And they will be hungry.
Ditto Mom2many.
Baby's sleep... varies all the time.
No baby/child/toddler/Tween/Teen/College Kid/Adult/Elderly... has slept the same way all their life. It changes.
A baby, cognitively and physically changes a great deal, every month. And so does their sleep. Sleep trained or not.
It is not static.