As the others have said, the aim is to have them eating 3 good solid meals (plus snacks) at about 12 months when solids do take over as the primary source of nutrition. The time between 6 and 12 months is about working towards that point. At 7.5 months I personally think it is way too early to swap around the order. When you get to 9, or probably even 10 months that might be a better time. Personally, I tend to think that leaving it till 12 months is probably a bit too late, as there is a transition period that they need to go through where they begin to realise that solids actually fill them up and BF isn't the only thing to cure the hunger pains - in my experience that took a good couple of months.

Mind you, I tended to go the other way and separate the BF and solids. DS would wake up at 5.30am or something like that and have a BF. I'd then offer him his solid breakfast at around 7.30am. If he ate well, he didn't have a BF till 9.30 or 10am. But if he wasn't into the solids, he'd have a BF not long after. But again, I didn't start doing this till at least 9 or 10 months. Before that, I treated eating solids as more of an activity or something to do - if he ate something, great, if not it was all about the experience.

By the time we got to 12 months he was eating 3 good meals a day, along with lots of snacks and having 3 BF's a day.