Baby feedings

Fatimah • Cooking baby #3 and #4⏳
Hi guys I just need some advice
My 5month old use to drink 
6 to 7oz each feeding sometimes 8oz)
And 4feedings a day 
4hours in between.
So few weeks ago she is only taking 4oz (5oz sometimes)
I think it's something to do with teething and shes eating solid now
Breakfast and dinner.
So I'm worried about her 
She's taking less oz a day that is Usually recommended
So today I'm feeding her every 3hours 
And it's a change to her routine.
Any suggestions? Should I stick to this new routine?