Hi, I can only tell you of my husband's experiences as he looked to become a HCA on the neonatal unit after our daughter's premature birth. The very short answer was that there isn't a neonatal unit within 50 miles of us that uses health care assistants, they are the only wards in the hospital that only use fully qualified staff. I don't know if this is a national regulation or just covers the northern group, easy way to find out would be to call your local hospital I guess.
After that he thought about being a HCA on pediatrics or emergency assessment, however he was told the hospital only hires HCAs who already have their level 2 or higher NVQ. You can't get a healthcare assistant NCQ in the classroom, it can only be done on the job, most commonly you get them working in care for the elderly, either in home or in a residential setting. So hubby worked weekends and evenings in a home and after 16 months he finally has his NVQ 2 and has gone full time as a senior carer and is about to start on his NVQ3. If you have a degree you won't struggle with the NVQ2 exams, they're done one by one, hubby actually found some of them fun rather than challenging! He has made the decision to stick with dementia care rather than to go into a hospital setting at this point as he loves what he is doing. Through his home they have offered him the option to train as a nurse, or to embark on the management training program, he's making the decision which way he wants to go.
As far as I'm aware it is only adult nursing and mental health nursing you can learn on the job, but it has to be employer provided/backed. There is one course on the OU that you can do with employer support, again this is something you could do as a HCA working in a care home for one of the larger organisations. However most nurses go to uni to train, and this remains necessary for childrens nursing. A qualified nurse can then chose to work up to being a nurse practitioner while on the job with employer support.
Did either of your children spend time on neonatal? I don't mean to be condescending if you've been through it (and if you have stop reading this paragraph as it will just come across as condescending but if you haven't I wanted to make you aware a tiny bit of what it's like in there), but neonatal is in no world like working on the post natal ward where you get to show mums how to bath the baby, breastfeed, take mums blood pressure and check how she's feeling. It's a massively interventionist system, most of the babies aren't handled except by mum and dad unless to do a procedure or change the nappy, preemie skin is hyper sensitive so handling really irritates them if they're very early. The babies born 34+ weeks might go straight to low dependency and have a more normal journey, just learning to feed, put on some weight etc, but early babies have a very different journey and I think the reason all staff on our neonatal wards were trained nurses is you never know when one of them are going to need emergency help. My son was 7 weeks old, 36 gestational, in low dependency for a few weeks, then for no apparent reason he dropped his sats down to 5%, went grey, but heart was still beating and he was shallow breathing, a nurse had the confidence to try to assess what was up and start treatment in the few minutes it took for a doctor to get there, if it had been a HCA feeding the baby in the next cot when I screamed for help I'm not sure the outcome would have been the same. I found it very upsetting being on neonatal the first time around, seeing all those lines of babies on ventilators, the constant tweaking of computers to monitor them, medication every hour, the infernal beeping of the sats monitors, coming in on a morning and finding the baby next to my son had moved from low dependency as a feeder grower back to intensive care and was now on 5 machines to keep him alive, the morning I came in early to care for my daughter and saw them try and fail to resuscitate the baby of the lady I'd befriended, and how upset some of the nurses were afterwards who had been looking after him that day. Don't get me wrong, neonatal nursing is a wonderful thing to do, and I think it's brilliant you'd like to work on the unit, but if you haven't spent time going through the process with a child I would very strongly suggest you call your local hospital, explain you're thinking of retraining and ask if there is a nurse who could show you around and maybe talk to you a bit about the job. I have nurse friends all of whom have said they did their few weeks on neonatal and ran as fast as they could to other wards, emotionally it's a massive burden to take on.
Don't take my word as gospel, but it is a field hubby has worked hard to get into for the last 2 years so I can only tell you what we've been finding out. Hope that helps x