There is some great advice already here.
I'm going to add this —
1) Stay out of your own way. This may be hard to do, but IMO it is essential to success. Stop comparing, contrasting & worrying about others (their experience, assignments, acuity). If I was an educator, I would be mildly alarmed if a "new" nurse did this and came to me with concerns about the types of patients they were getting (or not getting)
Now, even if you don't admit to the educator your concern about other new nurse assignments, it's been my experience that a nurse having "issues" has shared these concerns with co-workers. Word travels fast in some units. Scuttlebutt or gossip or the "concern" often gives folks something to talk about (or at least assure that focus is on someone besides them – lol). It's best avoided. Please avoid it.
Focus on you and set goals for your clinical practice. Decide you'd like to join AACN & work toward CCRN Pediatric certification (long term goal) — maybe there are AACN Core Classes offered near you (big plus!). Retake PALS and think about working toward being an instructor. Retake NRP. ECMO class. Do it all, aggressively seek knowledge. Basically never pass on an opportunity to learn something.
2) This is the biggie. Relax. Breathe. Think about where you are and be present. (Kinda an offshoot of 1, but here is the key!)
LEARN. Your patients are now paying your tuition. Never forget that. Ensure that what they "spend" makes you a better clinician.
Learn something from every patient. Every presentation is different. 3 patients may have pneumonia, but not all will present the same. Note the similarities and differences. Believe me, you want to be the goddess of assessment — everything starts there.
Treat every patient as an opportunity to learn, improve your clinical practice. Patients that look STABLE have a habit of deteriorating or becoming unstable — a thorough assessment and close monitoring allows you to become the nurse that can intervene before things turn deadly. You want to be that nurse. Do thorough assessments – always. Touch patients. Auscultate broadly — lol. Reassess and monitor often.
Develop SPIDEY SENSES. They save patients lives — those only came to me after I had practice proficiency (been there, seen that, done it).
You are 4 months in on a new speciality and you are a relatively newer nurse, but not getting feedback. So, okay — IMO no big deal on the feedback. Things are prolly fine. Trouble seeks you out — no need to look for it.
Other than head down, working hard, treating patients as opportunities to become proficient to excellent & looking for formal opportunities to learn — I'd just RELAX. It will come.