Ryan Gravenberch and long-time Newcastle target Hugo Ekitike struck for the English champions, either side of Anthony Gordon’s red card for a wild lunge on Virgil van Dijk.
But amid a frenzied atmosphere at St. James’ Park, the Magpies battled back through Bruno Guimaraes and William Osula only to be denied by teenage sensation Ngumoha, who became the youngest goalscorer in Liverpool’s history.
“This is also what makes the Premier League special,” said Liverpool manager Arne Slot. “Maybe it wasn’t the best game in terms of tactics or in terms of playing football, but I think every fan everywhere around the world enjoyed watching this game of football.”
Victory takes Liverpool level on maximum points from two games with Tottenham and title rivals Arsenal, who travel to Anfield on Sunday.
Newcastle remain without a win as they miss their wantaway talisman Alexander Isak.
The Swedish striker scored the winner when the sides last met in the League Cup final in March as Newcastle lifted their first domestic trophy for 70 years.
But Isak yet to feature for Eddie Howe’s men this season as he seeks an exit from Tyneside.
Liverpool are the likely destination if Isak does leave before the transfer window closes in a week’s time.
The Reds have reportedly had one bid of £110 million rejected as Newcastle want a British transfer record £150 million.
Adding to the Magpies’ frustration is the fact the Premier League champions also won the race to sign Ekitike, who Newcastle had lined up as a potential Isak replacement.
After failing to land a number of striker targets in the transfer market, Newcastle’s lack of a clinical number nine was exposed as they failed to break down 10-man Aston Villa in a 0-0 draw to begin their season last weekend.
And it cost them again during a dominant opening 30 minutes.
Roared on by a ferocious capacity crowd of over 50,000, Newcastle penned Liverpool inside their own half without finding the final finish.
Instead it was the visitors who took the lead completely against the run of play on 35 minutes.
Gravenberch took aim from well outside the area and powered an inch-perfect shot off the inside of the post. (AFP)