Just reading some of the comments regarding formula top ups and wanted to share a tale of support for any new mums regarding feeding;
The militant 'breast and ONLY breast at all costs' saw my newborn nephew's weightless dismissed- my sister wanted to supplement with formula just while her supply built up but was pushed away from this idea. Poor little man ended up in hospital at 10 days old, dehydrated and was starving.
Formula allowed him to quickly build up his weight again quickly while milk came in and BF was established. It then supported him at 3 weeks and again at 5 weeks old when my sister was admitted to hospital with septic mastitis.
He's now 9 months and EBF (now eating lots of solids) and a big chunky boy. Formula saved him and has not impacted breastfeeding at all.
The PP who said about considering formula like a medicine made a great point- some babies need a little extra support from formula and new mums shouldn't be pressured, shamed or judged for ensuring their baby is fed. These sneery attitudes can delay action being taken where it's needed.
And even if it DID mean BF never took off- surely better that than the alternative of leaving them starving?
However you're feeding your new baby- you're doing an awesome job. Congrats all.