Dez is starting to grab/want things he may not have. We try saying things like "Hot!" or "Ouch!" but sometimes you just have to say "No" because nothing else is relevant. Although, we have started "That's not a toy" and handing him something safe and saying, "this is a toy" but he doesn't easily give in. So, here's my question: Let's say he's reaching for something he may not have like scissors. If I keep saying "That's not a toy" and "Ouch! That can hurt you." and handing him a safe toy but he persists, should I move the scissors away out of sight OR is it more important that he sees that there are things he may not have and just comfort him while he cries and still wants the scissors? I'm not sure if my question is coming out clearly. Does this make sense?

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Re: "Disciplining" a 10m.o. ?
THIS! Babyproof and get that stuff out of reach. My DS has just reached this stage as well. IMO it is very important that we give our kids a home that is free (for the most part) to explore. We avoid "no" and instead try to redirect. I would rather save "no" for dangerous stuff that is unavoidable.
DD2 8.22.13
MMC 1.4.17 at 16w
Expecting #3, EDD 1.29.18
ok - at that age we had issues with Baz pulling up and standing in the bath. NOT OK. (even with the skid mat - it's just not ok.)
So I started saying - firmly but nicely - "no, no, on your heiney." And then I would help him sit and then he would try to stand again and I'd repeat myself...you get the point. Now, if I start out with "no,no..." he stops whatever he's doing mid-reach (or whatever) and we redirect there.
babies need clear direction and simple instructions.
Prepare your environment, but keep "no" in your arsenal.
BTW - don't underestimate your child. He's totally at that age where he can start understanding. Trust me.
This. We have the same issues in the bath tub & it's not like you can remove him from the bath every time he tries to pull up. Also, E always tries to grab his big brothers glasses & I have to tell him "no no, gentle touches please" and then I model a gentle touch on his arm or hand. I do the same thing when he pulls our hair. Is he old enough to understand? Maybe not quite yet, but I feel like it's important to start now.
Also any time he's touching something he shouldn't that we were unable to remove from the environment we say "not for little hands" in a firm but soft voice. At first I thought it was a lost cause... but you know what? It's been a few weeks now & when we say it he stops what he's doing & looks back at us like "what? I was just trying to touch it!" And then he usually goes for it again & we just repeat ourselves. After 2 or 3 tries he gives up & moves on to something else. He's learning.
I don't think it's horrible to say "no", I just think it's best to make the home as accessible to him as possible & then reserve "no" for situations where he could hurt himself or others.
I think it's never too early to know that you better listen to mommy. You're not saying/doing things just to be mean or punish - at this point it is all about safety.
Here are some other instances where my sing-songy (what Husband called it last night) "no-no" has worked (all since he was about 9 months old and these things are all now non-issues)
"no-no, sweetie, paper does not go in our mouths" (this is often coupled with "turn pages gently" and I can now give him paperback books to read in his car seat and the worst that happens is he tosses them when he's finished with them)
"no-no, honeypie, we do not eat crayons. yucky!"
"no-no, Sebastian Henry! We DO NOT put our hands in our poop!" (there was a little more force with that one and I ALWAYS used both names because it made him stop and stare at me. And also: eeeewwwwwww. He got a full bath after that one.)
"No-no, Buddy, sit on your heiny." In the bath, in high chairs, in the strollers. He also knows that when he pulls the plug on the tub his bath is over.
and
"no-no, we do not pull the cat's fur. We pet gently." And they are currently napping together.
things like scissors and knives and things that he could hurt himself with before learning how to properly use (motor skill development takes a few years) are out of his reach completely.
Ultimately, you know your child best. You know what he's capable of. Don't underestimate him. Try not to put too much pressure on him, either. But let him surprise you with how capable he is.
Good luck!