A six year old should know all those things, maybe the shoelaces would bea maybe, but definitely trying to tie or learning to tie would be good.

FSS6.5 doesn't need help using the washroom. I'm not sure about the alphabet exactly, and I do think that's something that varies a lot, but FSD3.5 can write not only her name, but some of her family members' names. She can also do and write (very) basic math.

That being said, I think things like the alphabet and writing can have a bigger window.

AFA intentional babytalk goes, none of FH's kids really do that (at least to my knowledge) so I'm not sure when that kicks in/out.

I am -pretty- sure FSS6 can tie his own shoes; he doesn't do it very quickly, but I'm pretty sure he is able to do it alone.

my sd who is 6 and a half knows all these things. She doesnt tie her laces very tight and sometimes she needs to be reminded to wipe better after #2, but shes pretty good. She did have trouble with her alphabet with certain words (shes going to be in 1st grade in august) at the beginning of this year, but dh worked diligently with her on that and now she can sight-read 60 something words, so shes on her way to learning how to read. I thought she was kinda a late bloomer on the tying the shoe thing and riding her bike with no training wheels, but i guess not. She can write her name pretty well too, some of her letters that she writes other wise are kind of sloppy and hard to tell what they are, but she is getting better.

Should know most of his alphabet if not all of it. Should know he has to wipe after using the toilet.
Babytalk? Just don't answer it.
Shoelaces? My youngest didn't know until he was 10. We didn't baby him, he just couldn't get his head around it. In time he learnt.
Spelling my name? My WHOLE name? All 27 leatters of all 3 words? I think I was 8.

my 5 year old does all those things but kids are different. And boys usually take longer.

Tying shoes- takes some kids longer. It's hard so give him slack. Try putting on slip on or Velcro shoes if you don't want to mess with it.

Writing name- should know how. Is it legible- mostly legible but some kids, esp boys just have bad handwriting skills. That can take time too. I don't see why that should bother you...

Potty- he should be doing better but yeah, some kids still need to be reminded to clean better instead of faster. Let his father handle it! In fact let father wash the laundry if ss is leaving behind umm...stains on their underwear.

Abc- Do you mean he doesn't know the abc song or he can't recognize letters when you point them out. He should know the song. He should be learning how to recognize letters although maybe getting confused on some. Since he should be in school, ask his teachers if he's behind at all. They'll let you know where your ss should be academically and develomentally.

1) wiping himself - absolutely should be able to do that

2) know the alphabet and write their own name - a child of 3 is capable of this, with the caveat that they've had the opportunity to learn to do it

3) "baby talk" - a child should NEVER do this. I think this usually persists because a grown up speaks to them that way, thinking it's cute. For example, my 3 year old has made up her own word 'whobody'. She says things like 'Whobody wants an ice cream?'. The proper way to handle this is to just repeat the sentence after her correctly by saying 'Who wants an ice cream? I do.' They should not be corrected and NEVER, under any circumstances should parents pick up that speech and use it because it's cute. (I do think 'whobody' is cute but I NEVER say so and I NEVER, EVER repeat it)

4) put on his own shoes and tie his own shoelaces - Every 4 year old (barring disability) is capable of this. Again, they have to have had the opportunity to learn and practice.

I taught ALL these things to my skids and we only have them EOW.
With tying shoes, break it into steps. Get something for them to practice on, preferably with 2 different colour ribbons to tie together. First, you do it very slowly talking only a little as you do it. Then let them try. If you can make something that has 4 or more pairs of ribbons to tie beneath each other it's better. Do it in these steps, assuming red is on the right and white on the left:

1. Bring both ends together and loop white under red. Say 'First we make a bridge'. Pull the ends so that the white end is to the right and the red end is to the left. If you have more than one set of ribbons do this step on all the rest of them.

2. Make a loop with the white end. Say 'Now we make a loop with the white one'. Hold the loop near the bottom with your right hand while wrapping the red on around the loop with your left hand. When the red end reaches your thumb of your right hand, grab the white loop with your left hand and use your right hand to pull the red end through. Pull the ends tight. You should have a bow with the red loop on the left and the white loop on the right.

Let the child practice this as much as they need to.

I have never seen this fail to teach a very young child to tie their own shoes.

Here is a photo of a bow tying frame. I make my own but there are many things out there that can be used.

Bow tying frame