I actually find the period between 4-8 months a really tough time; I'm likely to have gotten on top of the housework, dug out my makeup, and reclaimed the shopping centre only to regress back into my pyjamas at this point. I find it really tough, after the patterns of a newborn, to suddenly have a baby who needs so much attention and doesn't sleep nearly as much as I'd like him to! I also suspect that a lot of the lovely hormones support you through those early months, and when they go it's just you, an increasingly demanding baby and your sleep deprivation.
Of course things need to get done around the house; I just roll my eyes when people suggest it's possible to sleep when the baby sleeps. Maybe during those first couple of weeks, but it's just not realistic beyond then. It helps me to figure out what has to get done (basically laundry and cooking, and in my case tending to my other children's needs) and make sure those things are done every day. All the other things can be reduced for the time being, and remember it is
just for the time being, it won't be like this forever.
The Sustagen sounds like a good idea, as does getting out of the house and going for a walk. I know it can be hard to drag yourself out, but you really might find yourself revitalised (and out of your jammes!).
Things do get easier; caring for a baby is something you need to learn, and then relearn as they develop through each stage. I promise things get easier around 8-9 months; that age will bring its own challenges, but IMO they're a breeze compared to this incredibly intensive stage.



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