Can I add this into my baby's porridge? My mum has asked me to do it to make it more tasty.

Marmite contains numerous additives and preservatives and even banned in some countries like in UK. http://www.ibtimes.com/whats-really-marmite-and-why-it-banned-644308 Why not you try to make your own seasoning? It is very easy and cheap to make one yourself. There are a lot of varieties, e.g. onion powder, garlic powder, chicken powder, ikan bilis powder, and etc. These are preservative free and more healthy compared to commercial flavoring and seasoning. You can refer to these websites for the powder recipes: http://www.sustainablebabysteps.com/homemade-garlic-powder.html http://www.noobcook.com/ikan-bilis-anchovies-powder-step-by-step-photos/