Baudelaire was born in Paris, France, on 9 April 1821, and baptized two months later at Saint-Sulpice Roman Catholic Church. His father, Joseph-François Baudelaire (1759-1827), a senior civil servant and amateur artist, was 34 years older than Baudelaire's mother, Caroline (née Dufaÿs) (1794-1871). François died during Baudelaire's childhood, at rue Hautefeuille, Paris, on February 10, 1827. The following year, Caroline married Lieutenant Colonel Jacques Aupick, who later became a French ambassador to various noble courts. Baudelaire's biographers have often seen this as a crucial moment, considering that finding himself no longer the sole focus of his mother's affection left him with a trauma, which goes some way to explaining the excesses later apparent in his life. He stated in a letter to her that, "There was in my childhood a period of passionate love for you." Baudelaire regularly begged his mother for money throughout his career, often promising that a lucrative publishing contract or journalistic commission was just around the corner.
Baudelaire was educated in Lyon, where he boarded. At fourteen he was described by a classmate as "much more refined and distinguished than any of our fellow pupils ... we are bound to one another ... by shared tastes and sympathies, the precocious love of fine works of literature." Baudelaire was erratic in his studies, at times diligent, at other times prone to "idleness". Later, he attended the Lycée Louis-le-Grand in Paris, studying law, a popular course for those not yet decided on any particular career. He began to frequent prostitutes and may have contracted gonorrhea and syphilis during this period. He also began to run up debts, mostly for clothes. Upon gaining his degree in 1839, he told his brother "I don't feel I have a vocation for anything." His stepfather had in mind a career in law or diplomacy, but instead Baudelaire decided to embark upon a literary career. His mother later recalled: "Oh, what grief! If Charles had let himself be guided by his stepfather, his career would have been very different.... He would not have left a name in literature, it is true, but we should have been happier, all three of us."
His stepfather sent him on a voyage to Calcutta, India, in 1841 in the hope of ending his dissolute habits. The trip provided strong impressions of the sea, sailing, and exotic ports, that he later employed in his poetry. (Baudelaire later exaggerated his aborted trip to create a legend about his youthful travels and experiences, including "riding on elephants".) On returning to the taverns of Paris, he began to compose some of the poems of "Les Fleurs du Mal". At 21, he received a sizable inheritance but squandered much of it within a few years. His family obtained a decree to place his property in trust, which he resented bitterly, at one point arguing that allowing him to fail financially would have been the one sure way of teaching him to keep his finances in order.
Baudelaire became known in artistic circles as a dandy and free-spender, going through much of his inheritance and allowance in a short period of time. During this time, Jeanne Duval became his mistress. She was rejected by his family. His mother thought Duval a "Black Venus" who "tortured him in every way" and drained him of money at every opportunity. Baudelaire made a suicide attempt during this period.
He took part in the Revolutions of 1848 and wrote for a revolutionary newspaper. However, his interest in politics was passing, as he was later to note in his journals.
In the early 1850s, Baudelaire struggled with poor health, pressing debts, and irregular literary output. He often moved from one lodging to another to escape creditors. He undertook many projects that he was unable to complete, though he did finish translations of stories by Edgar Allan Poe.
Upon the death of his stepfather in 1857, Baudelaire received no mention in the will but he was heartened nonetheless that the division with his mother might now be mended. At 36 he wrote her: "believe that I belong to you absolutely, and that I belong only to you." His mother died on 16 August 1871, outliving her son by almost four years.