RJW part sizes of adults change shortly after spawn

I suggest to set the growthStage for Adults in Growing_Comp.cs : Initialize

if (AgeStages.IsYoungerThan(pawn, AgeStages.Adult))
{
    GrowToStage(AgeStages.GetAgeStage(pawn));
}
else
{
    growthStage = AgeStages.GetAgeStage(pawn);
}

I haven't tested potential other implications, though.