There isn't a need to change centre. You can build up his immunity for supplements. For the initial stages, i really gave alot of supplement to my elder child as his immunity isn't as good. I gave him childlife Vitamin C and First defence. After 6 months, i was able to see a difference. Most importantly is sleep well. lack of sleep will let their immunity be even lower.
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Babies with heart defects often have weaker immune systems. It can be harder for them to fight off infections. I am a heart warrior mum too. I feel you. Is this after his full repair or before?
Try starting off with all the supplements mentioned here and perhaps consult a reputable TCM...
supplements my dear, honey, and natural stuffs are better. less chemical.