( ( When ( ( a baby ) ( is born ) ) ) ( , ( ( certain connections ) ( ( ( have already ) ( been ( ( made-like connections ) ( for ( ( heartbeat and ) breathing ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (DT a) (NN baby)) (VP (VBZ is) (VP (VBN born))))) (, ,) (NP (JJ certain) (NNS connections)) (VP (VBP have) (ADVP (RB already)) (VP (VBN been) (NP (NP (JJ made-like) (NNS connections)) (PP (IN for) (NP (NN heartbeat) (CC and) (NN breathing)))))) (. .)))
When a baby is born, certain connections  have already been made-like connections for heartbeat and breathing.
(ROOT (S (NP (NP (DT A) (NN connection)) (PP (TO to) (NP (DT the) (NN placenta)))) (VP (VBZ is) (VP (VBN required) (PP (IN for) (NP (DT a) (JJ newborn) (NN baby))) (S (VP (TO to) (VP (VB begin) (NP (NN breathing))))))) (. .)))