Elecare formula

Summer

Does anyone use Elecare for their baby? The gi specialist wanted me to switch my son to Elecare but he is not a fan. He 2 months old but he hates the taste of it will gag on it and he keeps choking on it because it's so thin. He's only been on it for 2 days so I don't wanna give up on it just yet but he's not eating as much. I've called his Dr but they haven't called me back. Anyone else been through this...any advise?