Baby clothes are delicate though so use the lightest setting available. I agree with Ozak's suggestion of two WM to share the burden. Rather than have a single one give up under pressure and have to wait for replacement parts/etc and be left with no backup. More importantly, not only do you need child lock, you need to take the costs of running into consideration.
Your pre-laundry sorting has to be detailed as well to make clothes last longer. Don't mix heavy fabrics like jeans with t-shirts, must divide into whites/lights/coloured/darks and subdivide into delicates/etc.
This is where the two WM will come in handy since you can run both at the same time (on different settings for different laundry needs like I just mentioned). I hope you have sufficient space to maximise your laundry efficiency.
Also, because you have so much laundry, remember to clean the WM. I just cleaned mine after so long (silly little me needs a reminder) and my god, the grime collected inside the filters.
If you end up with Front Loaders, raise them on a pedestal high enough for your family members to use comfortably. Something like this.

For small space, you can even store laundry items underneath like so.

Another option is pedestal drawers that the brand sells (they don't sell it in Malaysia, or indeed Asia I think). More expensive and you can only store laundry powders and softeners, etc.

Samsung has these, as does LG. I'm not sure of the other Asian brands.
Good luck.