My job pays well, but after only 4 months, I'm looking to leave. Am I looking a gifted horse in the mouth?

I don't know whether or not I should leave the situation I'm in. I need some opinions, especially from anyone who's had a similar experience.

I (M23) am in a job that pays pretty well and doesn't make me work many hours (25$/h, 25 hours a week). I'm happy to not work too many hours, so long as I can make enough to pay my bills, you know? It's an ABA Therapy job. I work with one kid with ASD in his daycare. I teach him skills, I address his behaviors, and I help him function. The daycare is great, the pay is nice, and the flexibility is good... but I hate the work.

When the kid is behaving, it's great! When he's not? It's terrible. Awful. Frustrating enough to make me want to walk out. I'm tired of being bit, hit, and scratched on a regular basis. I've done great work with him and he's learning certain skills fast with me. His mother is super impressed! The daycare loves having me there! But I'm miserable.

Maybe working with kids isn't for me.

Is it too soon to leave? Should I stick it out? Should I leave? Does it matter? If I leave, do I mention that I've worked at this place at all? I stayed at my last job for only a year before leaving for this one, since the pay was nicer and it was closer to home.

I'm worried about looking flakey to a new employer.

I'd just like other people's opinions on this because I feel swamped right now.

Additional info that makes this harder to decide:

In a few weeks, the client I work for will be willing to take me on for full time hours. 8 hours a day at 25$/h. I know it's not going to make me wildly rich, I live pretty humbly, but it will be way more than I've ever made before. Come September, however, my client's schedule will change and the hours will get pretty substantially cut back. Potentially to even less that what I do now.

I'm in a line of work that I have about 5 years of experience in, with an unspecialized psych degree. My resume is pretty much only suited for this line of work (mental health counseling/behavior teaching), even though I don't particularly like it. If I'm stuck to this field, I worry that I won't find another place that pays me.as much as this one.

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