Its really hard to say. 1 week is better than nothing and 1 month is better than that and 1 year etc I think you need to do whats good for you. I think the first 12 months are pretty important IMO as breastmilk is pretty much their main source of nutrients after that solids tend to be more than just a taste iykwim? I don't know though I'm sure someone else will have a more thorough answer.

*hugs*
Cailin