Toddlers: Do you max all their skills??

Not always, but quite often I do. It's not difficult, so sometimes the toddlers max out the other skills on their own except thinking skill (on long life span they do max thinking too). I often only help them to max the thinking skill at first and let them do the rest of the skills by themselves.
It also depends on the toddlers, if I don't have any specific plans for them I just let them do whatever they want.

Does toddlers' skills affect the additional trait system for kids/teens in any way? Responsibility, manners etc? Or is it limited to normal skills?

Very rarely. I play on Normal lifespan so there isn't usually time.

If Skill Day is coming up or if the parent completed the Big Happy Family aspiration, then I definitely do it. No reason not to. Otherwise if I'm anxious to move the story along, I'll get all their skills to 3 instead.

Sometimes, but I don't push it. Not everyone needs to be a top-notch toddler. I play on a long lifespan, so at times I age up the toddlers a bit earlier. If they haven't maxed their skills yet when I want to age them up, then they just haven't.

@Simmerville Parents can use the "teach to say sorry/please and thank you" interactions with toddlers, and I believe it will influence both the communication skill and the related character value. They also get the same hit to responsibility that children do when making messes, and I think a few other interactions can have some effect on character values, but it generally moves the values by a smaller amount than during the child stage. I've never seen a lot of benefit of trying to work character values with toddlers because the gains are so small and their regular skills take up enough time if you play on normal.
There is a permanent trait that they get if all their toddler skills are at 3 and then a different one if they're all at 5 (except potty which maxes at 3). They both give permanent boosts to the speed of skill gain for all future life stages, in addition to starting their childhood with a skill boost. There is also a random happy moodlet sims can get if they have those traits because they remember a happy childhood or something like that, but I can't say whether that continues into adulthood offhand. I know my kids and teens get it.

If it happens they max one or two skills. But i don't try to do it.

Every time. It's super helpful for building skills later, and I've got a routine down for it that allows you to knock them out with a few days to spare.

Step 1: Talk to the teddy bear while Happy. This will max communication in a few sim hours.

Step 2: Use the slide from Toddler Stuff while Energized. This maxes movement in the next few sim hours after step 1. If you don't have the slide, have an adult Play with the toddler a few times, though this will take longer.

Step 3: Play with a toy while Playful. If the toddler has low energy, have an adult read them to sleep. This takes a few iterations, so be patient.

Step 4: Watch adults while Happy. This is the best way to take care of Thinking.

Step 5: Have the toddler go potty whenever their bladder is halfway down. Use potty training at every opportunity unless the toddler is independent.

This method gets toddler skills maxed with a few days to spare for fun.

"Sharonia;c-17438202" wrote:
My toddlers max their skills by themselves. It's not even hard on the longest life setting.

This is basically my experience and I usually use a normal life span. (minus the potty)As long as they have toys, a tablet, maybe another sibling/stuffed doll etc. I don't really have to push them. Ages ago,I'd race to get them all maxed through the parent sim(s) (super parent, what are ya gonna do? :p ). But after a while, I noticed that by just letting them learn on their own, they get a lot more done (and it wasn't just trait-based either to my surprise).

Now that's just without mods. Recently I added the "Better Education mod" (in general it makes school soo much better!!) that gives an optional preschool rabbithole for toddlers. It's a really cute idea for working families who just aren't fans of the nanny and they can also gain skills there too and meet other toddlers too (perfect "BFF since preschool" scenario :lol: ).

Maybe its just me, but I normally speed through the toddler phase just because they can't really do anything