What is a good child safety lock for the toilet seat?

Hey, One thing is that maybe there might be some loose plastic shavings in the fill line. From the Factory? or maybe was inside the water line going to the toilet when you connected the line to toilet. Shut off the water and get some towels and something to catch the water and disconnect it from the toilet and use bowl or what ever to catch the water and slowly turn it on and see if anything comes out. Maybe if it is in the line inside the toilet it might fall out by lightly tapping on the fill line inside the toilet to help it fall out. Just a thought when you said it "Sings" that sounds like trash inside the line going to the filler tube and bowl, hey try it who knows it might work. Okay

You're to replace shutting valve.

follow this steps and fix it. God bless you

f the toilet bowl overflows, use a plunger or auger to eliminate clogs. If the toilet does not flush, tighten or replace the defective handle , adjust or replace the lift chain , or replace the flush mechanism . Jiggling the handle forces the lift chain or rod to re-seat the flush mechanism, telling you that something is awry.

If the bowl drains sluggishly, remove the clog with a plunger or auger, or raise the water level in the tank .

If water runs continuously through the toilet, lower the water level in the tank , adjust or replace a lift chain or wire , repair or replace a worn flush valve , clean or replace the valve seat assembly .

If water appears under the tank, tighten the tank hold-down bolts , lower the water level in the tank, replace the float valve , replace a malfunctioning ball or tighten nuts on the water supply line, replace leaking supply line . As a last resort, re-seat the toilet .

If the seat is cracked or unsightly, replace it .

If the bowl or tank is cracked or otherwise unacceptable, replace the entire toilet .

Sorry for problem with new toilet.
You say water is leaking out of the bowl?

Toilets have 2 parts:
1) Tank: where water is stored for the flush and is sealed with a flapper.
2) Bowl: where water flushes down.

a) If tank is leaking water, then flapper is suspect. Replace flapper and see if that works.
Lift up flapper and run finger around rim to see if there is a rough spot that would indicate flush valve is defective, and needs replacement.
See typical flush valve

b) If bowl is leaking, that is very unusual and would indicate a crack in the porcelain.

If installer sold you the toilet, it is his responsibility to make good on product.
All products are guarantee against workmanship flaws.

As long as the water in the bowl dosent go below the bottom rim your ok there is a trap that the water has to seal that all it needs look at the side of your toilet you will see the trap water saver

If you want to be able to just tip the seat and let if fall without that loud slamming clank, look into getting some Drop-a-Seat cushions, a brand new product that is only $4.99 and absorbs the fall of the toilet seat and eliminates loud clanks. They're non-absorbent, have an easy stick-on installation, and are permanent but removable. www.drop-a-seat.com

I would check to see if the water holes are somehow blocked or pluged. also check the water level in the tank and make sure that the level is correct ( if not - adjust the water height ).
is this a new toilet ? did the problem just start ?

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There are two types of bowls as far as toilets are concerned...elongated and round front. The seats are interchangable as long as there isn't anything different in the way the seat is mounted to the toilet. As far as I know and my experiance with both brands, I can't see any reason why it would not work.