Hi OP
My dd (now 16) was born with a large (ish) VSD - I don’t know what the difference between an AVSD and a VSD is I’m afraid - but also a double outlet right ventricle, which means she had both arteries on the same side of where the “wall” should have been.
Pregnancy and birth weren’t affected by this.
She had an operation at 9 weeks old to put a band on the pulmonary artery to stop her lungs being flooded, and then another op to repair the VSD, in such a way that the wall then sag between the arteries as it should have, at 9/10 months. This was all at Great Ormond Street, who were amazing.
This was all very stressful at the time, but she is now a completely healthy 16 yo. Since her second op her heart hasn’t made the slightest difference to her life at all.
The bit that was really difficult was from about 4/5 weeks old until the first op, as she couldn’t really get enough calories from her milk, due to the extra effort needed to breathe. This meant she basically wanted to feed all day and all night. This is where I’d look into getting extra family support, getting your other half to take extra paternity leave, as it was really, really hard - and this is what I’d have liked to have been warned about before she was born.
BUT I don’t think all babies with VSD are the same - my dd was worse than she would otherwise have been re sleep because (as it turns out) she also had an undiagnosed tongue tie. In any case, your baby might need high calorie formula milk - and again, something that added to our problems was that DD was breast fed from the start and then refused to take a bottle to top up with formula. So it might be worth having some conversations about that.
Please do PM me if you want to!
Im not trying to be doom and gloom because dd is a happy and healthy 16 yo, predicted all 9s in her GCSEs, very involved in youth politics etc and lots of nice friends. So it’s all good really!!