The nurse should advise both the mother and the husband to spend equal time to each twin as this will strengthen the parental bonds to both twins and discourage favoritism since that is a common scenario in parents with twins.
The mother should also be encouraged to breastfeed both twins.
Lactic acid is created by our body when we can't breathe fast enough to get enough oxygen. For example, after running a while your muscles might start hurting, and that would be the lactic acid buildup because you couldn't get enough oxygen to keep you going. The reason the lactic acid buildup results in more oxygen is because you need oxygen to get rid of the lactic acid.