das Herzchen
little heart
The diminutive form of 'Herz' (heart). It refers to a small heart, often as a symbol of love and affection or as decoration.
Sie malte kleine Herzchen auf die Geburtstagskarte.
She drew little hearts on the birthday card.

little heart / sweetheart
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little heart
The diminutive form of 'Herz' (heart). It refers to a small heart, often as a symbol of love and affection or as decoration.
Sie malte kleine Herzchen auf die Geburtstagskarte.
She drew little hearts on the birthday card.

'Herzchen' (little heart/sweetheart) is the diminutive form of 'Herz' (heart). The ending '-chen' makes the word neuter ('das Herzchen') and expresses that something is small or cute.
Das kleine Mädchen trug ein T-Shirt mit einem Glitzer-Herzchen.
The little girl wore a T-shirt with a glittery little heart on it.
When 'Herzchen' (sweetheart) is used as a form of address for a person, it is almost always singular and often used with 'mein' (my). When it means a symbol, it can also appear in the plural and is often combined with verbs like 'malen' (to draw/paint) or 'basteln' (to make/craft).
Warte auf mich, mein Herzchen!
Wait for me, my sweetheart!
As a term of endearment, 'Herzchen' (sweetheart) is used only in very close, affectionate relationships, e.g. between partners or from grandparents to grandchildren. In other situations, it can sound condescending or inappropriate.
„Gute Nacht, mein Herzchen“, flüsterte die Mutter ihrem Kind zu.
'Good night, my sweetheart,' the mother whispered to her child.
heart
'das Herz' and 'das Herzchen' are closely related. 'das Herz' can mean the organ in the body or stand as a symbol for love and feelings. 'das Herzchen' is the small form of it and usually means a little heart as a symbol or decoration. It can also be an affectionate form of address. The words can be confused because 'Herzchen' feels like a small version of 'Herz'. For the real organ, you normally say 'Herz', not 'Herzchen'. For small symbols, stickers, or a tender form of address, 'Herzchen' is appropriate.

Auf der Geburtstagskarte malt Lena ein kleines Herzchen neben ihren Namen.
On the birthday card, Lena draws a little heart next to her name.
Nach dem schnellen Lauf schlägt mein Herz sehr stark.
After the fast run, my heart is beating very hard.