Lennat Mak from MTV Asia wrote about the song: "Written about Phoenix's birth and the joy she is bringing, the guitar-y ballad "Lullaby" has a heartfelt touch injected with such sincerity that it reveals a rarely seen side of Mel B: Motherly, affectionate, and loving.

"[3] Caroline Sullivan, writing for The Guardian, remarked that "Lullabye" was "one of those lapses into slurpiness, like Oasis's "Little James," that can happen to anyone.

"[4] Nigel Packer of BBC Music called "Lullaby" a "lightweight feel-good anthem which could have stepped straight from a cereal ad.

[7] A music video for "Lullaby" was directed by Andy Orrick and filmed in Morocco on 13 and 14 April 2001.

[8] The visuals feature Melanie walking down an alleyway singing and at one point helping a child tie his shoes.