Hello. Without the information I asked for, I can only give you a general answer, but I hope this helps. You can always come back to me for clarification if needed.
To appeal, and get your son home, you have to show that the judge made an error in fact, law or procedure in making their decision.
You only have 21 days to make this application.
The only people that can truly advise you on whether it is going to be worth pursuing are your lawyers that acted for you in the final hearing. A an outsider and by way of general guidance it is almost impossible to give a view as I don't have the wealth of knowledge of your case that your own lawyers do.
If you can't find grounds for appeal, you can challenge this again at the adoption order stage. By then (at leats 6 months away normally) you need to show that any concerns the court raised are no longer there, and you'll need evidence to back up your case if this is what you are saying to the court - such as GP's notes, counselling/ therapy, proof of income/ housing/ parenting assessments etc (depending on what the issues were in the recent court decision).
I trust that this helps.
Thank you for your enquiry today. I am happy to answer follow-up questions - please do get in touch with requests for extra information or further queries and I will do my best to help you.