Short answer is Yes. [Long answer follows
]
Whenever water changes haven't been what they should, it is less stressful for fish to have that worse water changed a bit more gradually.
It lessens the shock of clean water, or the difference between really clean water and really dirty toxic water. Fish often under stressful conditions need a gradual change.
Even if it takes 6 (or 10, as an example) 10% water changes - (also called back to back or b2b) - refill and repeat pwc, to get to a safe level for the fish.
You could divide the time commitment and do half the needed water changes at one time (or get to a safe level) and the other half 8-12 hours later to get to near perfect water quality.
THEN after getting caught up, you can continue at a normal rate of weekly pwc or as needed.
BUT since you have a finless Cory, you want to do what you can. A little bobber Cory with no fins needs ideal water to recover well.
After getting the water refreshed and safe for him and the rest of the fish they can be stronger to heal more quickly since they aren't in a stressful water condition.
Only you will know how to find a bit of time for the pwc needed. The fish are needing regular care. Maybe someone can help you for a small block of time each week say 15-20 min.
This way you can do a nice rotation of maintenance.
Do the necessary pwc amount, a usual base level of 25% is a good place to start.
Weekly PWC plus
#1
Rinse filter pads in treated or tank water put back in
#2
Wipe the inside of the glass if it needs it /remove algae spots, dead leaves
#3
Vac the feeding areas around the front
#4
Check all is in good working order, cords and power strip - no leaks
wipe inside rim where food falls inside the top rim and under it and the glass or hood top of tank, wipe off stand
#5 - happens about 7 months a year
Deep vac or whole filter /other maintenance
This is entirely flexible and you can skip wiping off the tank if it doesn't need it or you don't have time in the same block.
If someone is taking care of the baby, spend the other 10 minutes just enjoying a comforting beverage and
watching the tank
As mentioned it might take a couple extra vacuuming times to get the most mucky food out. In that case do worst half one time then the other half the next.
**I like to leave some time (1-2 weeks) between filter rinsing and substrate cleaning as BB grows both places. Not as much in the substrate but why stress the tank if not necessary.
Initially it is nice to get caught up, after that you can be flexible as when having kids THAT is a pretty much a necessity. Congratulations of the new little person to keep you really busy AND delighted.
If you find the tank is really dirty all the time consider feeding even less/changing foods or both.
Also you can get to the point of just spot vac'ing. Many planted tank keepers do little vac'ing. It takes time to learn your tanks needs for care.
Hoping you can enjoy the tank more, soon.