How much attention does a 7 month old baby need? I don't wanna overdo it.

Hmmm. I don't see why a parent would limit the amount of attention given to a baby. We're talking about a baby here! Babies need all the attention they can get! Attention gives them security, that they're not alone, there's someone there to take care of them; paying them attention teaches them how to communicate with others; and attention assures them that they're loved, period.